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* PerformanceMonitor
*
* Device capability detection and performance monitoring
* Provides adaptive behavior based on device performance
*
* Key Features:
* - Device performance tier detection (high, medium, low)
* - Real-time FPS monitoring
* - Frame drop detection
* - Adaptive quality recommendations
* - Memory usage tracking
*
* @module components/mobile/PerformanceMonitor
* @category Mobile Controls
* @korean 성능 모니터
*/
/**
* Device performance tier
*/
export type PerformanceTier = 'high' | 'medium' | 'low';
/**
* Performance metrics
*/
export interface PerformanceMetrics {
/** Current FPS (frames per second) */
readonly fps: number;
/** Average frame time in milliseconds */
readonly avgFrameTime: number;
/** Frame drop count in last second */
readonly frameDrops: number;
/** Memory usage in MB (if available) */
readonly memoryUsage: number | null;
/** Device performance tier */
readonly tier: PerformanceTier;
/** Is 60fps target being met */
readonly isSixtyFps: boolean;
}
/**
* Performance monitoring options
*/
export interface PerformanceMonitorOptions {
/** Sample window size in frames (default: 60) */
readonly sampleWindow?: number;
/** Target FPS (default: 60) */
readonly targetFps?: number;
/** Frame time threshold for drops in ms (default: 20) */
readonly frameDropThreshold?: number;
/** Enable memory monitoring (default: true) */
readonly enableMemoryMonitoring?: boolean;
}
/**
* PerformanceMonitor class
* Monitors device performance and provides adaptive recommendations
*
* @public
* @korean 성능모니터
*/
export class PerformanceMonitor {
private static instance: PerformanceMonitor | null = null;
private tier: PerformanceTier = 'high';
private fps: number = 60;
private avgFrameTime: number = 16.67;
private frameDrops: number = 0;
private memoryUsage: number | null = null;
private sampleWindow: number;
private frameDropThreshold: number;
private enableMemoryMonitoring: boolean;
private frameTimes: number[] = [];
private lastFrameTime: number = 0;
private rafId: number | null = null;
private isMonitoring: boolean = false;
/**
* Private constructor for singleton pattern
*/
private constructor(options: PerformanceMonitorOptions = {}) {
this.sampleWindow = options.sampleWindow ?? 60;
this.frameDropThreshold = options.frameDropThreshold ?? 20;
this.enableMemoryMonitoring = options.enableMemoryMonitoring ?? true;
this.tier = this.detectPerformanceTier();
}
/**
* Get singleton instance
*
* @param options - Performance monitor options
* @returns PerformanceMonitor instance
* @korean 인스턴스가져오기
*
* Note: Options are only applied on first initialization. Subsequent calls with
* options will ignore them and emit a warning. Configure the PerformanceMonitor
* on the first getInstance call only.
*/
public static getInstance(options?: PerformanceMonitorOptions): PerformanceMonitor {
if (this.instance !== null) {
Iif (options && Object.keys(options).length > 0) {
console.warn(
'PerformanceMonitor.getInstance: options provided after initial initialization are ignored. ' +
'Configure the PerformanceMonitor on the first getInstance call only.'
);
}
return this.instance;
}
this.instance = new PerformanceMonitor(options);
return this.instance;
}
/**
* Detect device performance tier
* Uses multiple heuristics to determine device capability
*
* Edge Cases:
* - Low-end desktops (2 cores, 2GB RAM) may score as 'medium' due to desktop bonus
* - High-end mobiles (6+ cores, 6GB+ RAM) correctly score as 'high'
* - Very low-spec devices (≤2 cores AND ≤2GB) are always 'low' regardless of platform
*
* This intentionally favors:
* - Devices with more CPU cores and memory
* - iOS devices (typically good performance)
* - Better network connections (4G/5G)
*
* @returns Performance tier (high, medium, low)
* @korean 성능등급감지
*/
private detectPerformanceTier(): PerformanceTier {
Iif (typeof navigator === 'undefined') {
return 'medium';
}
// Check navigator.hardwareConcurrency (CPU cores)
const cores = navigator.hardwareConcurrency ?? 4;
// Check device memory (if available)
const memory = (navigator as Navigator & { deviceMemory?: number }).deviceMemory ?? 4;
// Check if running on mobile
const isMobile = /Android|iPhone|iPad|iPod/i.test(navigator.userAgent);
// Check if on iOS (typically good performance)
const isIOS = /iPhone|iPad|iPod/i.test(navigator.userAgent);
// Check connection type (if available).
// If the Network Information API is unavailable, we treat connection quality as unknown
// and do not add any connection-based bonus to avoid overestimating capabilities.
const connection = (navigator as Navigator & { connection?: { effectiveType?: string } }).connection;
const connectionType = connection?.effectiveType;
// Very low-spec devices are always treated as low tier regardless of platform
// This prevents old desktops from being rated above high-end mobile devices
if (cores <= 2 && memory <= 2) {
return 'low';
}
// Heuristic scoring
let score = 0;
// More cores = better performance
if (cores >= 8) score += 3;
else if (cores >= 6) score += E2;
else if (cores >= 4) score += 1;
// More memory = better performance
if (memory >= 8) score += I3;
else if (memory >= 6) score += E2;
else if (memory >= 4) score += 1;
// Desktop generally performs better (limited bonus to avoid over-rating old desktops)
if (!isMobile) score += 1;
// iOS devices typically have good performance
if (isIOS) score += 1;
// Better connection = better overall experience (only if API is available)
if (connectionType === '4g' || connectionType === '5g') score += 1;
// Determine tier
if (score >= 6) return 'high';
Eif (score >= 3) return 'medium';
return 'low';
}
/**
* Start monitoring performance
* Begins tracking FPS and frame times
*
* @korean 모니터링시작
* @public
*/
public startMonitoring(): void {
if (this.isMonitoring) return;
this.isMonitoring = true;
this.lastFrameTime = performance.now();
this.frameTimes = [];
this.frameDrops = 0;
this.monitorFrame();
}
/**
* Stop monitoring performance
*
* @korean 모니터링중지
* @public
*/
public stopMonitoring(): void {
this.isMonitoring = false;
Eif (this.rafId !== null) {
cancelAnimationFrame(this.rafId);
this.rafId = null;
}
}
/**
* Monitor frame timing
* Called on every animation frame
*
* @korean 프레임모니터링
*/
private monitorFrame = (): void => {
Iif (!this.isMonitoring) return;
const now = performance.now();
const frameTime = now - this.lastFrameTime;
this.lastFrameTime = now;
// Add frame time to sample window
this.frameTimes.push(frameTime);
Iif (this.frameTimes.length > this.sampleWindow) {
this.frameTimes.shift();
}
// Detect frame drops (frame time exceeds threshold)
Iif (frameTime > this.frameDropThreshold) {
this.frameDrops++;
}
// Calculate metrics every sample window
Iif (this.frameTimes.length === this.sampleWindow) {
this.calculateMetrics();
// Reset frame drops counter
this.frameDrops = 0;
}
// Update memory usage
Eif (this.enableMemoryMonitoring) {
this.updateMemoryUsage();
}
// Schedule next frame
this.rafId = requestAnimationFrame(this.monitorFrame);
};
/**
* Calculate performance metrics from frame times
*
* @korean 메트릭계산
*/
private calculateMetrics(): void {
if (this.frameTimes.length === 0) return;
// Calculate average frame time
const sum = this.frameTimes.reduce((acc, time) => acc + time, 0);
this.avgFrameTime = sum / this.frameTimes.length;
// Calculate FPS
this.fps = 1000 / this.avgFrameTime;
}
/**
* Update memory usage metrics
*
* @korean 메모리사용량업데이트
*/
private updateMemoryUsage(): void {
if (typeof performance === 'undefined' || !('memory' in performance)) {
return;
}
const memory = (performance as Performance & {
memory?: {
usedJSHeapSize?: number;
totalJSHeapSize?: number;
}
}).memory;
Eif (memory?.usedJSHeapSize) {
// Convert bytes to MB
this.memoryUsage = Math.round(memory.usedJSHeapSize / (1024 * 1024));
}
}
/**
* Get current performance metrics
*
* @returns Current performance metrics
* @korean 메트릭가져오기
* @public
*/
public getMetrics(): PerformanceMetrics {
return {
fps: Math.round(this.fps),
avgFrameTime: Math.round(this.avgFrameTime * 100) / 100,
frameDrops: this.frameDrops,
memoryUsage: this.memoryUsage,
tier: this.tier,
isSixtyFps: this.fps >= 58, // Allow 2fps tolerance
};
}
/**
* Get device performance tier
*
* @returns Performance tier
* @korean 성능등급가져오기
* @public
*/
public getPerformanceTier(): PerformanceTier {
return this.tier;
}
/**
* Check if device can handle 60fps
*
* @returns True if 60fps is achievable
* @korean 60fps가능여부
* @public
*/
public canHandle60Fps(): boolean {
return this.tier !== 'low' && this.fps >= 58;
}
/**
* Get recommended quality settings based on performance
*
* @returns Quality recommendations
* @korean 품질권장사항가져오기
* @public
*/
public getQualityRecommendations(): {
enableHaptics: boolean;
enableParticles: boolean;
enableShadows: boolean;
targetFps: number;
coalescingRate: number;
} {
switch (this.tier) {
case 'high':
return {
enableHaptics: true,
enableParticles: true,
enableShadows: true,
targetFps: 60,
coalescingRate: 5, // Sample more events
};
case 'medium':
return {
enableHaptics: true,
enableParticles: true,
enableShadows: false,
targetFps: 60,
coalescingRate: 3, // Moderate sampling
};
case 'low':
return {
enableHaptics: false,
enableParticles: false,
enableShadows: false,
targetFps: 30,
coalescingRate: 1, // Minimal sampling
};
}
}
/**
* Check if frame drops are occurring
*
* @returns True if frame drops detected
* @korean 프레임드롭감지
* @public
*/
public hasFrameDrops(): boolean {
return this.frameDrops > 3; // More than 3 drops per sample window
}
/**
* Get current FPS
*
* @returns Current FPS
* @korean FPS가져오기
* @public
*/
public getCurrentFps(): number {
return Math.round(this.fps);
}
/**
* Get average frame time
*
* @returns Average frame time in milliseconds
* @korean 평균프레임타임가져오기
* @public
*/
public getAvgFrameTime(): number {
return Math.round(this.avgFrameTime * 100) / 100;
}
/**
* Reset performance metrics
*
* @korean 메트릭리셋
* @public
*/
public reset(): void {
this.frameTimes = [];
this.frameDrops = 0;
this.fps = 60;
this.avgFrameTime = 16.67;
}
}
/**
* Convenience function to get performance monitor instance
*
* @returns PerformanceMonitor instance
* @korean 성능모니터가져오기
* @public
*/
export function getPerformanceMonitor(): PerformanceMonitor {
return PerformanceMonitor.getInstance();
}
/**
* Convenience function to get current performance tier
*
* @returns Performance tier
* @korean 성능등급가져오기
* @public
*/
export function getPerformanceTier(): PerformanceTier {
return PerformanceMonitor.getInstance().getPerformanceTier();
}
/**
* Convenience function to check if device can handle 60fps
*
* @returns True if 60fps is achievable
* @korean 60fps가능여부
* @public
*/
export function canHandle60Fps(): boolean {
return PerformanceMonitor.getInstance().canHandle60Fps();
}
/**
* Convenience function to get quality recommendations
*
* @returns Quality recommendations
* @korean 품질권장사항가져오기
* @public
*/
export function getQualityRecommendations() {
return PerformanceMonitor.getInstance().getQualityRecommendations();
}
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