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Baseline Profiles improve app startup and runtime performance by reducing the need for Just-In-Time compilation. Learn how to use Baseline Profiles to optimize your app.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],[],[],[],null,["# Enable app optimization\n\nFor the best user experience, you should optimize your app to make it as small\nand fast as possible. Our app optimizer, called R8, streamlines your app by\nremoving unused code and resources, rewriting code to optimize runtime\nperformance, and more. To your users, this means:\n\n- Faster startup time\n- Improved rendering and runtime performance\n- Fewer [ANRs](/topic/performance/anrs/keep-your-app-responsive)\n\n| **Important:** You should always enable optimization for your app's release build; however, you probably don't want to enable it for tests or libraries. For more information about using R8 with tests, see [Test and troubleshoot the\n| optimization](/topic/performance/app-optimization/test-and-troubleshoot-the-optimization). For more information about enabling R8 from libraries, see [Optimization for library authors](/topic/performance/app-optimization/library-optimization).\n\nTo enable app optimization, set `isMinifyEnabled = true` (for code optimization)\nand `isShrinkResources = true` (for resource optimization) in your [release\nbuild's](/studio/publish/preparing#turn-off-debugging) app-level build script as shown in the following code. We recommend\nthat you always enable both settings. We also recommend enabling app\noptimization only in the final version of your app that you test before\npublishing---usually your release build---because the optimizations increase the\nbuild time of your project and can make debugging harder due to the way it\nmodifies code. \n\n### Kotlin\n\n```kotlin\nandroid {\n buildTypes {\n release {\n\n // Enables code-related app optimization.\n isMinifyEnabled = true\n\n // Enables resource shrinking.\n isShrinkResources = true\n\n proguardFiles(\n // Default file with automatically generated optimization rules.\n getDefaultProguardFile(\"proguard-android-optimize.txt\"),\n\n ...\n )\n ...\n }\n }\n ...\n}\n```\n\n### Groovy\n\n```groovy\nandroid {\n buildTypes {\n release {\n\n // Enables code-related app optimization.\n minifyEnabled true\n\n // Enables resource shrinking.\n shrinkResources true\n\n // Default file with automatically generated optimization rules.\n proguardFiles getDefaultProguardFile('proguard-android-optimize.txt')\n\n ...\n }\n }\n}\n```\n\nAdditionally, verify that R8 uses its full optimization capabilities by\nremoving this line from your project's `gradle.properties` file, if it exists: \n\n android.enableR8.fullMode=false # Remove this line from your codebase.\n\nNote that enabling app optimization makes stack traces difficult to understand,\nespecially if R8 renames class or method names. To get stack traces that\ncorrectly correspond to your source code, see\n[Recover the original stack trace](/topic/performance/app-optimization/test-and-troubleshoot-the-optimization#recover-original-stack-trace).\n\nIf R8 is enabled, you should also [create Startup Profiles](/topic/performance/baselineprofiles/dex-layout-optimizations) for even better\nstartup performance.\n\nIf you enable app optimization and it causes errors, here are some strategies to\nfix them:\n\n- [Add keep rules](/topic/performance/app-optimization/add-keep-rules) to keep some code untouched.\n- [Adopt optimizations incrementally](/topic/performance/app-optimization/adopt-optimizations-incrementally).\n- Update your code to [use libraries that are better suited for optimization](/topic/performance/app-optimization/choose-libraries-wisely).\n\n| **Caution:** Tools that replace or modify R8's output can negatively impact runtime performance. R8 is careful about including and testing many optimizations at the code level, in [DEX layout](/topic/performance/app-optimization/6), and in correctly producing Baseline Profiles - other tools producing or modifying DEX files may break these optimizations, or otherwise regress performance."]]
