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gradle-build-performance

Debug and optimize Android/Gradle build performance. Use when builds are slow, investigating CI/CD performance, analyzing build scans, or identifying compilation bottlenecks.

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Price unconfirmed★ 948 GitHub starsRegistry updated · Sep 2, 2026agent-skill

Overview

Debug and optimize Android/Gradle build performance. Use when builds are slow, investigating CI/CD performance, analyzing build scans, or identifying compilation bottlenecks.

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Gradle Build Performance

When to Use

Build times are slow (clean or incremental)
Investigating build performance regressions
Analyzing Gradle Build Scans
Identifying configuration vs execution bottlenecks
Optimizing CI/CD build times
Enabling Gradle Configuration Cache
Reducing unnecessary recompilation
Debugging kapt/KSP annotation processing

Example Prompts

"My builds are slow, how can I speed them up?"
"How do I analyze a Gradle build scan?"
"Why is configuration taking so long?"
"Why does my project always recompile everything?"
"How do I enable configuration cache?"
"Why is kapt so slow?"

Workflow

Measure Baseline — Clean build + incremental build times
Generate Build Scan — ./gradlew assembleDebug --scan
Identify Phase — Configuration? Execution? Dependency resolution?
Apply ONE optimization — Don't batch changes
Measure Improvement — Compare against baseline
Verify in Build Scan — Visual confirmation

Quick Diagnostics

Generate Build Scan

./gradlew assembleDebug --scan

Profile Build Locally

./gradlew assembleDebug --profile
# Opens report in build/reports/profile/

Build Timing Summary

./gradlew assembleDebug --info | grep -E "^\:.*"
# Or view in Android Studio: Build > Analyze APK Build

Build Phases

Phase	What Happens	Common Issues
Initialization	`settings.gradle.kts` evaluated	Too many `include()` statements
Configuration	All `build.gradle.kts` files evaluated	Expensive plugins, eager task creation
Execution	Tasks run based on inputs/outputs	Cache misses, non-incremental tasks

Identify the Bottleneck

Build scan → Performance → Build timeline

Long configuration phase: Focus on plugin and buildscript optimization
Long execution phase: Focus on task caching and parallelization
Dependency resolution slow: Focus on repository configuration

12 Optimization Patterns

1. Enable Configuration Cache

Caches configuration phase across builds (AGP 8.0+):

# gradle.properties
org.gradle.configuration-cache=true
org.gradle.configuration-cache.problems=warn

2. Enable Build Cache

Reuses task outputs across builds and machines:

# gradle.properties
org.gradle.caching=true

3. Enable Parallel Execution

Build independent modules simultaneously:

# gradle.properties
org.gradle.parallel=true

4. Increase JVM Heap

Allocate more memory for large projects:

# gradle.properties
org.gradle.jvmargs=-Xmx4g -XX:+UseParallelGC

5. Use Non-Transitive R Classes

Reduces R class size and compilation (AGP 8.0+ default):

# gradle.properties
android.nonTransitiveRClass=true

6. Migrate kapt to KSP

KSP is 2x faster than kapt for Kotlin:

// Before (slow)
kapt("com.google.dagger:hilt-compiler:2.51.1")

// After (fast)
ksp("com.google.dagger:hilt-compiler:2.51.1")

7. Avoid Dynamic Dependencies

Pin dependency versions:

// BAD: Forces resolution every build
implementation("com.example:lib:+")
implementation("com.example:lib:1.0.+")

// GOOD: Fixed version
implementation("com.example:lib:1.2.3")

8. Optimize Repository Order

Put most-used repositories first:

// settings.gradle.kts
dependencyResolutionManagement {
    repositories {
        google()      // First: Android dependencies
        mavenCentral() // Second: Most libraries
        // Third-party repos last
    }
}

9. Use includeBuild for Local Modules

Composite builds are faster than project() for large monorepos:

// settings.gradle.kts
includeBuild("shared-library") {
    dependencySubstitution {
        substitute(module("com.example:shared")).using(project(":"))
    }
}

10. Enable Incremental Annotation Processing

# gradle.properties
kapt.incremental.apt=true
kapt.use.worker.api=true

11. Avoid Configuration-Time I/O

Don't read files or make network calls during configuration:

// BAD: Runs during configuration
val version = file("version.txt").readText()

// GOOD: Defer to execution
val version = providers.fileContents(file("version.txt")).asText

12. Use Lazy Task Configuration

Avoid create(), use register():

// BAD: Eagerly configured
tasks.create("myTask") { ... }

// GOOD: Lazily configured
tasks.register("myTask") { ... }

Common Bottleneck Analysis

Slow Configuration Phase

Symptoms: Build scan shows long "Configuring build" time

Causes & Fixes:

Cause	Fix
Eager task creation	Use `tasks.register()` instead of `tasks.create()`
buildSrc with many dependencies	Migrate to Convention Plugins with `includeBuild`
File I/O in build scripts	Use `providers.fileContents()`
Network calls in plugins	Cache results or use offline mode

Slow Compilation

Symptoms: :app:compileDebugKotlin takes too long

Causes & Fixes:

Cause	Fix
Non-incremental changes	Avoid `build.gradle.kts` changes that invalidate cache
Large modules	Break into smaller feature modules
Excessive kapt usage	Migrate to KSP
Kotlin compiler memory	Increase `kotlin.daemon.jvmargs`

Cache Misses

Symptoms: Tasks always rerun despite no changes

Causes & Fixes:

Cause	Fix
Unstable task inputs	Use `@PathSensitive`, `@NormalizeLineEndings`
Absolute paths in outputs	Use relative paths
Missing `@CacheableTask`	Add annotation to custom tasks
Different JDK versions	Standardize JDK across environments

CI/CD Optimizations

Remote Build Cache

// settings.gradle.kts
buildCache {
    local { isEnabled = true }
    remote<HttpBuildCache> {
        url = uri("https://cache.example.com/")
        isPush = System.getenv("CI") == "true"
        credentials {
            username = System.getenv("CACHE_USER")
            password = System.getenv("CACHE_PASS")
        }
    }
}

Gradle Enterprise / Develocity

For advanced build analytics:

// settings.gradle.kts
plugins {
    id("com.gradle.develocity") version "3.17"
}

develocity {
    buildScan {
        termsOfUseUrl.set("https://gradle.com/help/legal-terms-of-use")
        termsOfUseAgree.set("yes")
        publishing.onlyIf { System.getenv("CI") != null }
    }
}

Skip Unnecessary Tasks in CI

# Skip tests for UI-only changes
./gradlew assembleDebug -x test -x lint

# Only run affected module tests
./gradlew :feature:login:test

Android Studio Settings

File → Settings → Build → Gradle

Gradle JDK: Match your project's JDK
Build and run using: Gradle (not IntelliJ)
Run tests using: Gradle

File → Settings → Build → Compiler

Compile independent modules in parallel: ✅ Enabled
Configure on demand: ❌ Disabled (deprecated)

Verification Checklist

After optimizations, verify:

Configuration cache enabled and working
Build cache hit rate > 80% (check build scan)
No dynamic dependency versions
KSP used instead of kapt where possible
Parallel execution enabled
JVM memory tuned appropriately
CI remote cache configured
No configuration-time I/O

References

View source ↗

File metadata

name: gradle-build-performance
description: Debug and optimize Android/Gradle build performance. Use when builds are slow, investigating CI/CD performance, analyzing build scans, or identifying compilation bottlenecks.

View original text

---
name: gradle-build-performance
description: Debug and optimize Android/Gradle build performance. Use when builds are slow, investigating CI/CD performance, analyzing build scans, or identifying compilation bottlenecks.
---

# Gradle Build Performance

## When to Use

- Build times are slow (clean or incremental)
- Investigating build performance regressions
- Analyzing Gradle Build Scans
- Identifying configuration vs execution bottlenecks
- Optimizing CI/CD build times
- Enabling Gradle Configuration Cache
- Reducing unnecessary recompilation
- Debugging kapt/KSP annotation processing

## Example Prompts

- "My builds are slow, how can I speed them up?"
- "How do I analyze a Gradle build scan?"
- "Why is configuration taking so long?"
- "Why does my project always recompile everything?"
- "How do I enable configuration cache?"
- "Why is kapt so slow?"

---

## Workflow

1. **Measure Baseline** — Clean build + incremental build times
2. **Generate Build Scan** — `./gradlew assembleDebug --scan`
3. **Identify Phase** — Configuration? Execution? Dependency resolution?
4. **Apply ONE optimization** — Don't batch changes
5. **Measure Improvement** — Compare against baseline
6. **Verify in Build Scan** — Visual confirmation

---

## Quick Diagnostics

### Generate Build Scan

```bash
./gradlew assembleDebug --scan
```

### Profile Build Locally

```bash
./gradlew assembleDebug --profile
# Opens report in build/reports/profile/
```

### Build Timing Summary

```bash
./gradlew assembleDebug --info | grep -E "^\:.*"
# Or view in Android Studio: Build > Analyze APK Build
```

---

## Build Phases

| Phase | What Happens | Common Issues |
|-------|--------------|---------------|
| **Initialization** | `settings.gradle.kts` evaluated | Too many `include()` statements |
| **Configuration** | All `build.gradle.kts` files evaluated | Expensive plugins, eager task creation |
| **Execution** | Tasks run based on inputs/outputs | Cache misses, non-incremental tasks |

### Identify the Bottleneck

```
Build scan → Performance → Build timeline
```

- **Long configuration phase**: Focus on plugin and buildscript optimization
- **Long execution phase**: Focus on task caching and parallelization
- **Dependency resolution slow**: Focus on repository configuration

---

## 12 Optimization Patterns

### 1. Enable Configuration Cache

Caches configuration phase across builds (AGP 8.0+):

```properties
# gradle.properties
org.gradle.configuration-cache=true
org.gradle.configuration-cache.problems=warn
```

### 2. Enable Build Cache

Reuses task outputs across builds and machines:

```properties
# gradle.properties
org.gradle.caching=true
```

### 3. Enable Parallel Execution

Build independent modules simultaneously:

```properties
# gradle.properties
org.gradle.parallel=true
```

### 4. Increase JVM Heap

Allocate more memory for large projects:

```properties
# gradle.properties
org.gradle.jvmargs=-Xmx4g -XX:+UseParallelGC
```

### 5. Use Non-Transitive R Classes

Reduces R class size and compilation (AGP 8.0+ default):

```properties
# gradle.properties
android.nonTransitiveRClass=true
```

### 6. Migrate kapt to KSP

KSP is 2x faster than kapt for Kotlin:

```kotlin
// Before (slow)
kapt("com.google.dagger:hilt-compiler:2.51.1")

// After (fast)
ksp("com.google.dagger:hilt-compiler:2.51.1")
```

### 7. Avoid Dynamic Dependencies

Pin dependency versions:

```kotlin
// BAD: Forces resolution every build
implementation("com.example:lib:+")
implementation("com.example:lib:1.0.+")

// GOOD: Fixed version
implementation("com.example:lib:1.2.3")
```

### 8. Optimize Repository Order

Put most-used repositories first:

```kotlin
// settings.gradle.kts
dependencyResolutionManagement {
    repositories {
        google()      // First: Android dependencies
        mavenCentral() // Second: Most libraries
        // Third-party repos last
    }
}
```

### 9. Use includeBuild for Local Modules

Composite builds are faster than `project()` for large monorepos:

```kotlin
// settings.gradle.kts
includeBuild("shared-library") {
    dependencySubstitution {
        substitute(module("com.example:shared")).using(project(":"))
    }
}
```

### 10. Enable Incremental Annotation Processing

```properties
# gradle.properties
kapt.incremental.apt=true
kapt.use.worker.api=true
```

### 11. Avoid Configuration-Time I/O

Don't read files or make network calls during configuration:

```kotlin
// BAD: Runs during configuration
val version = file("version.txt").readText()

// GOOD: Defer to execution
val version = providers.fileContents(file("version.txt")).asText
```

### 12. Use Lazy Task Configuration

Avoid `create()`, use `register()`:

```kotlin
// BAD: Eagerly configured
tasks.create("myTask") { ... }

// GOOD: Lazily configured
tasks.register("myTask") { ... }
```

---

## Common Bottleneck Analysis

### Slow Configuration Phase

**Symptoms**: Build scan shows long "Configuring build" time

**Causes & Fixes**:
| Cause | Fix |
|-------|-----|
| Eager task creation | Use `tasks.register()` instead of `tasks.create()` |
| buildSrc with many dependencies | Migrate to Convention Plugins with `includeBuild` |
| File I/O in build scripts | Use `providers.fileContents()` |
| Network calls in plugins | Cache results or use offline mode |

### Slow Compilation

**Symptoms**: `:app:compileDebugKotlin` takes too long

**Causes & Fixes**:
| Cause | Fix |
|-------|-----|
| Non-incremental changes | Avoid `build.gradle.kts` changes that invalidate cache |
| Large modules | Break into smaller feature modules |
| Excessive kapt usage | Migrate to KSP |
| Kotlin compiler memory | Increase `kotlin.daemon.jvmargs` |

### Cache Misses

**Symptoms**: Tasks always rerun despite no changes

**Causes & Fixes**:
| Cause | Fix |
|-------|-----|
| Unstable task inputs | Use `@PathSensitive`, `@NormalizeLineEndings` |
| Absolute paths in outputs | Use relative paths |
| Missing `@CacheableTask` | Add annotation to custom tasks |
| Different JDK versions | Standardize JDK across environments |

---

## CI/CD Optimizations

### Remote Build Cache

```kotlin
// settings.gradle.kts
buildCache {
    local { isEnabled = true }
    remote<HttpBuildCache> {
        url = uri("https://cache.example.com/")
        isPush = System.getenv("CI") == "true"
        credentials {
            username = System.getenv("CACHE_USER")
            password = System.getenv("CACHE_PASS")
        }
    }
}
```

### Gradle Enterprise / Develocity

For advanced build analytics:

```kotlin
// settings.gradle.kts
plugins {
    id("com.gradle.develocity") version "3.17"
}

develocity {
    buildScan {
        termsOfUseUrl.set("https://gradle.com/help/legal-terms-of-use")
        termsOfUseAgree.set("yes")
        publishing.onlyIf { System.getenv("CI") != null }
    }
}
```

### Skip Unnecessary Tasks in CI

```bash
# Skip tests for UI-only changes
./gradlew assembleDebug -x test -x lint

# Only run affected module tests
./gradlew :feature:login:test
```

---

## Android Studio Settings

### File → Settings → Build → Gradle

- **Gradle JDK**: Match your project's JDK
- **Build and run using**: Gradle (not IntelliJ)
- **Run tests using**: Gradle

### File → Settings → Build → Compiler

- **Compile independent modules in parallel**: ✅ Enabled
- **Configure on demand**: ❌ Disabled (deprecated)

---

## Verification Checklist

After optimizations, verify:

- [ ] Configuration cache enabled and working
- [ ] Build cache hit rate > 80% (check build scan)
- [ ] No dynamic dependency versions
- [ ] KSP used instead of kapt where possible
- [ ] Parallel execution enabled
- [ ] JVM memory tuned appropriately
- [ ] CI remote cache configured
- [ ] No configuration-time I/O

---

## References

- [Optimize Build Speed](https://developer.android.com/build/optimize-your-build)
- [Gradle Configuration Cache](https://docs.gradle.org/current/userguide/configuration_cache.html)
- [Gradle Build Cache](https://docs.gradle.org/current/userguide/build_cache.html)
- [Migrate from kapt to KSP](https://developer.android.com/build/migrate-to-ksp)
- [Gradle Build Scans](https://scans.gradle.com/)

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Source repository: new-silvermoon/awesome-android-agent-skills
License: Apache-2.0
Version: 1.0.0
Last GitHub push: Jul 27, 2026
Registry updated: Sep 2, 2026
Instruction path: .github/skills/performance/gradle-build-performance/SKILL.md @ 82900eacc8db

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    "outcome_evidence": {
      "total": 0,
      "successes": 0,
      "failures": 0,
      "not_relevant": 0,
      "success_rate": null,
      "recent_success_rate": null,
      "recent_failure_rate": null,
      "install_attempts": 0,
      "install_success_rate": null,
      "risk_blocked": 0,
      "setup_required": 0,
      "avg_output_quality": null,
      "production_outcomes": 0,
      "last_outcome_at": null,
      "label": "No agent outcome data yet"
    },
    "auto_install": {
      "allowed": false,
      "sandbox_required": true,
      "reason": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
    },
    "best_for": [
      "design-creative",
      "agent-skill"
    ],
    "known_risks": [
      "Quality score needs review",
      "Permission surface needs review: secrets or environment access, shell or command execution",
      "Dependency/runtime risk: command execution surface, credential or environment access",
      "Permission surface: secrets or environment access, shell or command execution"
    ]
  },
  "agent_proven": {
    "version": "agent-proven-v1",
    "score": 0,
    "tier": "unproven",
    "label": "Needs first agent run",
    "summary": "No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.",
    "metrics": {
      "totalOutcomes": 0,
      "successfulOutcomes": 0,
      "failedOutcomes": 0,
      "installAttempts": 0,
      "installSuccessRate": null,
      "successRate": null,
      "recentSuccessRate": null,
      "recentFailureRate": null,
      "riskBlocked": 0,
      "setupRequired": 0,
      "notRelevant": 0,
      "avgOutputQuality": null,
      "avgTimeToUsefulMs": null,
      "productionOutcomes": 0,
      "humanReviewRequired": 0,
      "uniqueAgents": 0,
      "lastOutcomeAt": null
    },
    "signals": [],
    "penalties": [
      "No real agent outcome evidence yet"
    ]
  },
  "audit": {
    "score": 77,
    "risk_level": "needs_review",
    "risk_label": "Needs review",
    "warnings": [
      "Dependency or permission surface needs review",
      "Permission surface may require sandboxing",
      "Quality score needs review",
      "Permission surface needs review: secrets or environment access, shell or command execution",
      "Dependency/runtime risk: command execution surface, credential or environment access",
      "Permission surface: secrets or environment access, shell or command execution"
    ]
  },
  "safety_gate": {
    "tier": "blocked",
    "label": "Blocked for auto-install",
    "auto_install_policy": "block",
    "auto_install_allowed": false,
    "human_review_required": true,
    "blocked": true,
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
  },
  "quality": {
    "score": 70,
    "label": "Strong"
  },
  "supply": {
    "track": "Coding and developer agents",
    "scenario": "Coding agents",
    "maintenance": "3mo since push",
    "risk": "Needs review"
  },
  "alternative_skills": [],
  "do_not_use_when": [
    "teams that need a vendor-supported SLA",
    "high-compliance environments without internal security review",
    "No major risk signals from current metadata",
    "High-risk permission hints: Shell or command execution, Secrets or environment access",
    "Dependency or permission surface needs review",
    "Permission surface may require sandboxing",
    "Quality score needs review",
    "Permission surface needs review: secrets or environment access, shell or command execution"
  ],
  "agent_contract": {
    "task_input": "Use gradle-build-performance in an agent workflow",
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
    "install_policy": "block",
    "minimum_review_before_use": [
      "Trust: 74/100 Strong shortlist",
      "Audit: 77/100 Needs review",
      "Safety: 37/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "new-silvermoon-gradle-build-performance (gradle-build-performance)",
      "install_command": "npx skills add new-silvermoon/awesome-android-agent-skills --skill gradle-build-performance",
      "risk_summary": "Needs review; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "new-silvermoon-gradle-build-performance",
      "task": "Use gradle-build-performance in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/new-silvermoon-gradle-build-performance",
    "api": "https://www.openagentskill.com/api/agent/skills/new-silvermoon-gradle-build-performance",
    "audit": "https://www.openagentskill.com/skills/new-silvermoon-gradle-build-performance/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=new-silvermoon-gradle-build-performance&task=Use%20gradle-build-performance%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20gradle-build-performance%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20gradle-build-performance%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/new-silvermoon-gradle-build-performance/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/new-silvermoon-gradle-build-performance"
  }
}

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Creator: new-silvermoon
Source: new-silvermoon/awesome-android-agent-skills
Indexed by: OpenAgentSkill community index

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Overview

Gradle Build Performance

When to Use

Example Prompts

Workflow

Quick Diagnostics

Generate Build Scan

Profile Build Locally

Build Timing Summary

Build Phases

Identify the Bottleneck

12 Optimization Patterns

1. Enable Configuration Cache

2. Enable Build Cache

3. Enable Parallel Execution

4. Increase JVM Heap

5. Use Non-Transitive R Classes

6. Migrate kapt to KSP

7. Avoid Dynamic Dependencies

8. Optimize Repository Order

9. Use includeBuild for Local Modules

10. Enable Incremental Annotation Processing

11. Avoid Configuration-Time I/O

12. Use Lazy Task Configuration

Common Bottleneck Analysis

Slow Configuration Phase

Slow Compilation

Cache Misses

CI/CD Optimizations

Remote Build Cache

Gradle Enterprise / Develocity

Skip Unnecessary Tasks in CI

Android Studio Settings

File → Settings → Build → Gradle

File → Settings → Build → Compiler

Verification Checklist

References

Review the source

Price & running costs

Start with one small task

Source & usage notes

Agent access

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