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mobile-performance-testing Mobile application performance testing including app launch time, frame rendering, memory profiling, battery consumption, network throttling, and crash analytics using Appium, XCTest, and Espresso with real device testing.
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name Mobile Performance Testing description Mobile application performance testing including app launch time, frame rendering, memory profiling, battery consumption, network throttling, and crash analytics using Appium, XCTest, and Espresso with real device testing. version 1.0.0 author thetestingacademy license MIT tags ["mobile-performance","app-launch-time","frame-rendering","memory-profiling","battery-testing","network-throttling","appium","espresso","xctest","crash-analytics"] testingTypes ["performance","mobile","e2e","integration"] frameworks ["appium","espresso","xctest","detox"] languages ["typescript","javascript","kotlin","swift"] domains ["mobile","performance","ios","android"] agents ["claude-code","cursor","github-copilot","windsurf","codex","aider","continue","cline","zed","bolt","gemini-cli","amp"]
Mobile Performance Testing Skill
You are an expert in mobile application performance testing. When the user asks you to test mobile app performance, measure launch times, profile memory usage, test under network conditions, or set up mobile performance monitoring, follow these detailed instructions.
Core Principles
Real device testing over emulators -- Performance measurements on emulators do not represent real-world behavior. Always validate on real devices with representative hardware.Cold start and warm start measurement -- Measure both cold start (app loaded from scratch) and warm start (app resumed from background) times. Users experience both.Frame rendering performance -- Target 60fps (16.6ms per frame) for smooth UI. Measure jank frames, frozen frames, and total frame drop percentage.Memory profiling under load -- Monitor memory allocation, peak usage, and garbage collection frequency during typical and stress scenarios.Network-aware performance -- Test on 2G, 3G, 4G, and WiFi conditions. Many users operate on slow or unreliable connections.Battery consumption measurement -- Track CPU wake locks, network activity, GPS usage, and background processing that drain battery.Baseline comparison -- Every performance test must compare against a baseline from the previous release to detect regressions.
Project Structure
mobile-perf-tests/
android/
launch-time/
cold-start.test.ts
warm-start.test.ts
deep-link-start.test.ts
rendering/
frame-rate.test.ts
scroll-performance.test.ts
animation-jank.test.ts
memory/
memory-leak-detection.test.ts
large-list-memory.test.ts
image-cache-memory.test.ts
network/
slow-network.test.ts
offline-mode.test.ts
large-payload.test.ts
battery/
background-drain.test.ts
location-tracking-drain.test.ts
ios/
launch-time/
cold-start.test.ts
warm-start.test.ts
rendering/
frame-rate.test.ts
scroll-performance.test.ts
memory/
memory-warnings.test.ts
image-cache.test.ts
helpers/
performance-collector.ts
adb-helper.ts
network-throttler.ts
metrics-reporter.ts
baselines/
android-baseline.json
ios-baseline.json
config/
device-profiles.ts
performance-thresholds.ts
reports/
.gitkeep
App Launch Time Testing
import { describe, it, expect, beforeAll, afterAll } from 'vitest' ;
interface
LaunchMetrics
coldStartMs
number
timeToFirstFrameMs
number
timeToInteractiveMs
number
totalDrawnFrames
number
describe
'Android Cold Start Performance'
() =>
const
APP_PACKAGE
'com.example.app'
const
LAUNCH_ACTIVITY
'.MainActivity'
const
ITERATIONS
10
const
THRESHOLD_MS
2000
it
'should launch within threshold on average'
async
const
measurements
number
for
let
0
ITERATIONS
await
execAdb
`shell am force-stop ${APP_PACKAGE} `
await
sleep
2000
await
execAdb
`shell pm clear ${APP_PACKAGE} `
await
sleep
1000
const
await
execAdb
`shell am start-activity -W -n ${APP_PACKAGE} /${LAUNCH_ACTIVITY} `
const
parseLaunchTime
push
const
reduce
(a, b ) =>
0
length
const
sort
(a, b ) =>
Math
floor
length
0.95
const
Math
max
console
log
`Cold start: avg=${average.toFixed(0 )} ms, p95=${p95} ms, max=${max} ms`
expect
toBeLessThan
THRESHOLD_MS
expect
toBeLessThan
THRESHOLD_MS
1.5
it
'should render first frame within 1 second'
async
await
execAdb
`shell am force-stop ${APP_PACKAGE} `
await
sleep
2000
const
Date
now
await
execAdb
`shell am start-activity -W -n ${APP_PACKAGE} /${LAUNCH_ACTIVITY} `
const
await
execAdb
'shell dumpsys gfxinfo '
APP_PACKAGE
const
parseFirstFrameTime
expect
toBeLessThan
1000
it
'should show improvement over baseline'
async
const
await
loadBaseline
'cold-start'
const
await
measureColdStart
const
100
console
log
`Baseline: ${baseline} ms, Current: ${current} ms, Change: ${regression.toFixed(1 )} %`
expect
toBeLessThan
10
async
function
execAdb
command : string
Promise
string
const
await
import
'child_process'
return
execSync
`adb ${command} `
encoding
'utf-8'
function
parseLaunchTime
output : string
number
const
match
/TotalTime:\s*(\d+)/
return
parseInt
1
10
0
function
parseFirstFrameTime
output : string
number
const
match
/Janky frames:\s*\d+.*?(\d+)ms/
return
parseInt
1
10
0
async
function
loadBaseline
metric : string
Promise
number
const
await
import
'fs'
const
JSON
parse
readFileSync
'baselines/android-baseline.json'
'utf-8'
return
0
async
function
measureColdStart
Promise
number
const
APP_PACKAGE
'com.example.app'
const
LAUNCH_ACTIVITY
'.MainActivity'
await
execAdb
`shell am force-stop ${APP_PACKAGE} `
await
sleep
2000
const
await
execAdb
`shell am start-activity -W -n ${APP_PACKAGE} /${LAUNCH_ACTIVITY} `
return
parseLaunchTime
function
sleep
ms : number
Promise
void
return
new
Promise
(resolve ) =>
setTimeout
Memory Profiling
import { describe, it, expect } from 'vitest' ;
describe ('Memory Leak Detection' , () => {
const APP_PACKAGE = 'com.example.app' ;
const THRESHOLD_MB = 200 ;
it ('should not leak memory during navigation cycles' , async () => {
const initialMemory = await getAppMemory (APP_PACKAGE );
const memorySnapshots : number [] = [initialMemory];
for (let i = 0 ; i < 20 ; i++) {
await navigateToScreen ('home' );
await navigateToScreen ('profile' );
await navigateToScreen ('settings' );
await navigateToScreen ('home' );
const memory = await getAppMemory (APP_PACKAGE );
memorySnapshots.push (memory);
}
await execAdb (`shell am dumpheap ${APP_PACKAGE} /dev/null` );
await sleep (3000 );
const finalMemory = await getAppMemory (APP_PACKAGE );
const memoryGrowth = finalMemory - initialMemory;
console .log (`Memory: initial=${initialMemory} MB, final=${finalMemory} MB, growth=${memoryGrowth} MB` );
expect (finalMemory).toBeLessThan (THRESHOLD_MB );
const isLinearGrowth = checkLinearGrowth (memorySnapshots);
expect (isLinearGrowth).toBe (false );
});
it ('should handle large image lists without OOM' , async () => {
await navigateToScreen ('image-gallery' );
for (let i = 0 ; i < 20 ; i++) {
await scrollDown ();
await sleep (500 );
}
const memory = await getAppMemory (APP_PACKAGE );
expect (memory).toBeLessThan (THRESHOLD_MB );
const crashes = await getRecentCrashes (APP_PACKAGE );
expect (crashes.filter ((c : string c.includes ('OutOfMemoryError' ))).toHaveLength (0 );
});
});
async function getAppMemory (packageName : string Promise <number > {
const output = await execAdb (`shell dumpsys meminfo ${packageName} ` );
const match = output.match (/TOTAL\s+(\d+)/ );
return match ? parseInt (match[1 ], 10 ) / 1024 : 0 ;
}
function checkLinearGrowth (snapshots : number []boolean {
if (snapshots.length < 5 ) return false ;
const diffs = snapshots.slice (1 ).map ((v, i ) => v - snapshots[i]);
const avgDiff = diffs.reduce ((a, b ) => a + b, 0 ) / diffs.length ;
return avgDiff > 2 && diffs.every ((d ) => d > 0 );
}
async function navigateToScreen (screen : string Promise <void > {
}
async function scrollDown (Promise <void > {
await execAdb ('shell input swipe 500 1500 500 500 300' );
}
async function getRecentCrashes (packageName : string Promise <string []> {
const output = await execAdb (`shell logcat -d -s AndroidRuntime:E | grep ${packageName} ` );
return output.split ('\n' ).filter (Boolean );
}
async function execAdb (command : string Promise <string > {
const { execSync } = await import ('child_process' );
return execSync (`adb ${command} ` , { encoding : 'utf-8' });
}
function sleep (ms : number Promise <void > {
return new Promise ((resolve ) => setTimeout (resolve, ms));
}
Network Throttling Tests
import { describe, it, expect, beforeAll, afterAll } from 'vitest' ;
describe ('Slow Network Performance' , () => {
const networkProfiles = {
'3G' : { download : 750 , upload : 250 , latency : 100 },
'2G' : { download : 50 , upload : 25 , latency : 300 },
'slow-wifi' : { download : 2000 , upload : 1000 , latency : 50 },
'lossy' : { download : 5000 , upload : 2000 , latency : 200 },
};
afterAll (async () => {
await disableNetworkThrottling ();
});
it ('should load main feed within 5s on 3G' , async () => {
await setNetworkProfile (networkProfiles['3G' ]);
const startTime = Date .now ();
await navigateToScreen ('feed' );
await waitForContentLoaded ();
const loadTime = Date .now () - startTime;
console .log (`Feed load on 3G: ${loadTime} ms` );
expect (loadTime).toBeLessThan (5000 );
});
it ('should show loading indicator on slow connections' , async () => {
await setNetworkProfile (networkProfiles['2G' ]);
await navigateToScreen ('feed' );
const hasLoadingIndicator = await checkElementVisible ('loading-spinner' );
expect (hasLoadingIndicator).toBe (true );
});
it ('should gracefully handle offline mode' , async () => {
await setAirplaneMode (true );
await navigateToScreen ('feed' );
const hasOfflineMessage = await checkElementVisible ('offline-message' );
expect (hasOfflineMessage).toBe (true );
await setAirplaneMode (false );
});
it ('should retry failed requests on connection recovery' , async () => {
await setAirplaneMode (true );
await navigateToScreen ('feed' );
await setAirplaneMode (false );
await sleep (5000 );
const hasContent = await checkElementVisible ('feed-content' );
expect (hasContent).toBe (true );
});
});
async function setNetworkProfile (profile : { download: number ; upload: number ; latency: number }Promise <void > {
console .log (`Setting network: ${profile.download} kbps down, ${profile.upload} kbps up, ${profile.latency} ms latency` );
}
async function disableNetworkThrottling (Promise <void > {
console .log ('Disabling network throttling' );
}
async function setAirplaneMode (enabled : boolean Promise <void > {
const { execSync } = await import ('child_process' );
execSync (`adb shell settings put global airplane_mode_on ${enabled ? 1 : 0 } ` );
execSync (`adb shell am broadcast -a android.intent.action.AIRPLANE_MODE` );
}
async function navigateToScreen (screen : string Promise <void > {}
async function waitForContentLoaded (Promise <void > { await sleep (100 ); }
async function checkElementVisible (id : string Promise <boolean > { return true ; }
function sleep (ms : number Promise <void > { return new Promise ((r ) => setTimeout (r, ms)); }
Frame Rate Performance Testing
import { describe, it, expect } from 'vitest' ;
interface FrameStats {
totalFrames : number ;
jankFrames : number ;
frozenFrames : number ;
p50RenderTimeMs : number ;
p95RenderTimeMs : number ;
p99RenderTimeMs : number ;
fps : number ;
}
describe ('Frame Rate Performance' , () => {
const APP_PACKAGE = 'com.example.app' ;
const TARGET_FPS = 60 ;
const MAX_JANK_PERCENTAGE = 5 ;
it ('should maintain 60fps during list scrolling' , async () => {
await resetFrameStats (APP_PACKAGE );
await navigateToScreen ('product-list' );
for (let i = 0 ; i < 20 ; i++) {
await execAdb ('shell input swipe 500 1500 500 300 200' );
await sleep (500 );
}
const stats = await getFrameStats (APP_PACKAGE );
console .log (`FPS: ${stats.fps} , Jank: ${stats.jankFrames} /${stats.totalFrames} ` );
console .log (`Render times: p50=${stats.p50RenderTimeMs} ms, p95=${stats.p95RenderTimeMs} ms, p99=${stats.p99RenderTimeMs} ms` );
expect (stats.fps ).toBeGreaterThanOrEqual (TARGET_FPS * 0.9 );
const jankPercentage = (stats.jankFrames / stats.totalFrames ) * 100 ;
expect (jankPercentage).toBeLessThan (MAX_JANK_PERCENTAGE );
});
it ('should not have frozen frames during navigation' , async () => {
await resetFrameStats (APP_PACKAGE );
const screens = ['home' , 'search' , 'profile' , 'settings' , 'home' ];
for (const screen of screens) {
await navigateToScreen (screen);
await sleep (1000 );
}
const stats = await getFrameStats (APP_PACKAGE );
expect (stats.frozenFrames ).toBe (0 );
});
it ('should maintain frame rate during animations' , async () => {
await resetFrameStats (APP_PACKAGE );
await navigateToScreen ('animations-demo' );
await execAdb ('shell input tap 500 500' );
await sleep (2000 );
await execAdb ('shell input tap 500 800' );
await sleep (2000 );
const stats = await getFrameStats (APP_PACKAGE );
expect (stats.p95RenderTimeMs ).toBeLessThan (16.67 );
});
});
async function resetFrameStats (packageName : string Promise <void > {
await execAdb (\`shell dumpsys gfxinfo \${packageName} reset\`);
}
async function getFrameStats(packageName: string): Promise<FrameStats> {
const output = await execAdb(\`shell dumpsys gfxinfo \${packageName}\`);
const totalMatch = output.match(/Total frames rendered: (\\d+)/);
const jankMatch = output.match(/Janky frames: (\\d+)/);
const frozenMatch = output.match(/Number Missed Vsync: (\\d+)/);
const totalFrames = totalMatch ? parseInt(totalMatch[1], 10) : 0;
const jankFrames = jankMatch ? parseInt(jankMatch[1], 10) : 0;
const frozenFrames = frozenMatch ? parseInt(frozenMatch[1], 10) : 0;
// Parse frame timing histogram
const renderTimes = parseFrameTimings(output);
renderTimes.sort((a, b) => a - b);
return {
totalFrames,
jankFrames,
frozenFrames,
p50RenderTimeMs: percentile(renderTimes, 50),
p95RenderTimeMs: percentile(renderTimes, 95),
p99RenderTimeMs: percentile(renderTimes, 99),
fps: totalFrames > 0 ? Math.round(totalFrames / 10) : 0,
};
}
function parseFrameTimings(output: string): number[] {
const lines = output.split('\\n');
const timings: number[] = [];
let inHistogram = false;
for (const line of lines) {
if (line.includes('HISTOGRAM')) inHistogram = true;
if (inHistogram && line.match(/^\\d/)) {
const parts = line.trim().split(/\\s+/);
if (parts.length >= 2) {
timings.push(parseFloat(parts[0]));
}
}
}
return timings;
}
function percentile(values: number[], p: number): number {
if (values.length === 0) return 0;
const index = Math.ceil(values.length * (p / 100)) - 1;
return values[Math.max(0, index)];
}
async function execAdb(command: string): Promise<string> {
const { execSync } = await import('child_process');
return execSync(\`adb \${command}\`, { encoding: 'utf-8' });
}
async function navigateToScreen(screen: string): Promise<void> {}
function sleep(ms: number): Promise<void> { return new Promise((r) => setTimeout(r, ms)); }
Battery Consumption Testing
import { describe, it, expect } from 'vitest' ;
describe ('Battery Consumption' , () => {
const APP_PACKAGE = 'com.example.app' ;
it ('should not drain more than 2% battery in 30 minutes of background' , async () => {
const initialBattery = await getBatteryLevel ();
await execAdb (\`shell am start -n \${APP_PACKAGE}/.MainActivity\`);
await sleep(5000);
await execAdb('shell input keyevent KEYCODE_HOME'); // Send to background
// Wait 30 minutes (or simulated time)
await sleep(30 * 60 * 1000);
const finalBattery = await getBatteryLevel();
const drain = initialBattery - finalBattery;
console.log(\`Battery drain: \${drain}% over 30 minutes\`);
expect(drain).toBeLessThanOrEqual(2);
});
it('should release wake locks when backgrounded', async () => {
await execAdb(\`shell am start -n \${APP_PACKAGE}/.MainActivity\`);
await sleep(5000);
await execAdb('shell input keyevent KEYCODE_HOME');
await sleep(10000);
const wakeLocks = await getAppWakeLocks(APP_PACKAGE);
expect(wakeLocks).toBe(0);
});
});
async function getBatteryLevel(): Promise<number> {
const output = await execAdb('shell dumpsys battery');
const match = output.match(/level: (\\d+)/);
return match ? parseInt(match[1], 10) : 0;
}
async function getAppWakeLocks(packageName: string): Promise<number> {
const output = await execAdb(\`shell dumpsys power | grep \${packageName}\`);
return (output.match(/PARTIAL_WAKE_LOCK/g) || []).length;
}
async function execAdb(command: string): Promise<string> {
const { execSync } = await import('child_process');
return execSync(\`adb \${command}\`, { encoding: 'utf-8' });
}
function sleep(ms: number): Promise<void> { return new Promise((r) => setTimeout(r, ms)); }
App Size Monitoring
export interface AppSizeReport {
totalSizeMB : number ;
downloadSizeMB : number ;
installSizeMB : number ;
components : Array <{
name : string ;
sizeMB : number ;
percentage : number ;
}>;
thresholdStatus : 'pass' | 'warning' | 'fail' ;
}
export function analyzeApkSize (apkPath : string AppSizeReport {
return {
totalSizeMB : 0 ,
downloadSizeMB : 0 ,
installSizeMB : 0 ,
components : [],
thresholdStatus : 'pass' ,
};
}
export const APP_SIZE_THRESHOLDS = {
totalMB : { warning : 50 , critical : 100 },
downloadMB : { warning : 30 , critical : 60 },
dexFilesMB : { warning : 10 , critical : 20 },
nativeLibsMB : { warning : 15 , critical : 30 },
resourcesMB : { warning : 20 , critical : 40 },
};
Best Practices
Test on real devices with representative hardware -- Low-end and mid-range devices represent the majority of users. Do not only test on flagship phones.Measure cold and warm start separately -- Users experience both scenarios. Cold start matters for first impressions; warm start matters for daily usage.Run performance tests multiple times -- A single measurement is noisy. Run at least 10 iterations and report median and p95 values.Test under realistic network conditions -- Use network throttling to simulate 3G, 4G, and lossy WiFi connections.Monitor memory across the entire user session -- Brief memory spikes are acceptable. Continuous growth indicates leaks.Establish baselines and track regressions -- Store performance baselines per release and fail tests when regressions exceed thresholds.Test with realistic data volumes -- Empty lists and single items do not stress the app. Use hundreds of items with images and complex layouts.Include battery impact in performance criteria -- An app that drains 10% battery per hour will get uninstalled regardless of feature quality.Automate performance tests in CI -- Run performance tests on every release branch, not just manually before launch.Profile before optimizing -- Use Android Profiler and Xcode Instruments to identify actual bottlenecks instead of guessing.
Anti-Patterns
Only testing on emulators -- Emulator performance does not represent real device behavior. GPU rendering, memory management, and CPU throttling differ significantly.Measuring performance once -- Single measurements are unreliable due to JIT compilation, background processes, and thermal throttling. Always aggregate multiple runs.Ignoring low-end devices -- Most users do not have flagship phones. Test on devices with 2-3GB RAM and mid-range processors.Not testing offline scenarios -- Users frequently lose connectivity. Apps that crash or hang without network are unusable.Skipping scroll performance testing -- Janky scrolling is the most user-visible performance issue. Always measure frame rates during scroll.Testing only on WiFi -- WiFi performance masks network-dependent bottlenecks. Always include 3G and 4G testing.Not monitoring memory during long sessions -- Memory leaks may not appear in 30-second tests. Simulate 5-10 minute user sessions.Ignoring app size -- Large APK/IPA files increase download time, storage usage, and initial launch time. Monitor and set size budgets.Not testing background behavior -- Apps that consume CPU and network in the background drain battery and may be killed by the OS.Comparing performance across different device models -- Always compare same-device measurements across versions, not different devices in the same run. 