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* PerformanceMonitor - Real-time FPS and performance tracking for Three.js
*
* Monitors frame rate, memory usage, and draw calls to maintain 60fps target.
* Provides warnings in development mode when performance degrades.
*/
import * as THREE from "three";
export interface PerformanceMetrics {
readonly fps: number;
readonly avgFps: number;
readonly minFps: number;
readonly maxFps: number;
readonly frameTime: number;
readonly memoryMB: number;
readonly drawCalls: number;
readonly triangles: number;
}
export interface PerformanceThresholds {
readonly targetFps: number;
readonly minAcceptableFps: number;
readonly maxMemoryMB: number;
readonly maxDrawCalls: number;
}
const DEFAULT_THRESHOLDS: PerformanceThresholds = {
targetFps: 60,
minAcceptableFps: 55,
maxMemoryMB: 300,
maxDrawCalls: 100,
};
// Prevent unrealistic spikes when frame deltas are extremely small (e.g., mocked timers)
const MAX_SAMPLE_FPS = 180;
const MIN_FRAME_TIME_MS = 1000 / MAX_SAMPLE_FPS;
/**
* PerformanceMonitor class for real-time performance tracking
*/
export class PerformanceMonitor {
private frames: number[] = [];
private lastTime = performance.now();
private frameCount = 0;
private readonly maxFrameSamples = 60; // Track last 60 frames (1 second at 60fps)
private minFps = Infinity;
private maxFps = 0;
private readonly thresholds: PerformanceThresholds;
private performanceWarnings: string[] = [];
constructor(thresholds: Partial<PerformanceThresholds> = {}) {
this.thresholds = { ...DEFAULT_THRESHOLDS, ...thresholds };
}
/**
* Update performance metrics (call once per frame)
* @param renderer Optional Three.js renderer for draw call tracking
* @returns Current FPS
*/
update(renderer?: THREE.WebGLRenderer): number {
const now = performance.now();
const delta = now - this.lastTime;
this.lastTime = now;
if (delta <= 0) return 0; // Skip invalid frames
const clampedDelta = Math.max(delta, MIN_FRAME_TIME_MS);
const fps = Math.min(1000 / clampedDelta, MAX_SAMPLE_FPS);
this.frames.push(fps);
// Track min/max FPS
if (fps < this.minFps) this.minFps = fps;
if (fps > this.maxFps) this.maxFps = fps;
// Keep frames array bounded
if (this.frames.length > this.maxFrameSamples) {
this.frames.shift();
}
this.frameCount++;
// Check performance thresholds (only in dev mode)
if (import.meta.env.DEV && this.frameCount % 60 === 0) {
this.checkPerformanceThresholds(renderer);
}
return fps;
}
/**
* Get current FPS
*/
getCurrentFPS(): number {
if (this.frames.length === 0) return 0;
return this.frames[this.frames.length - 1];
}
/**
* Get average FPS over the sampling window
*/
getAverageFPS(): number {
if (this.frames.length === 0) return 0;
return this.frames.reduce((a, b) => a + b, 0) / this.frames.length;
}
/**
* Get minimum FPS recorded
*/
getMinFPS(): number {
return this.minFps === Infinity ? 0 : this.minFps;
}
/**
* Get maximum FPS recorded
*/
getMaxFPS(): number {
return this.maxFps;
}
/**
* Check if performance is good (above minimum threshold)
*/
isPerformanceGood(): boolean {
const avgFps = this.getAverageFPS();
return avgFps >= this.thresholds.minAcceptableFps;
}
/**
* Get comprehensive performance metrics
*/
getMetrics(renderer?: THREE.WebGLRenderer): PerformanceMetrics {
const avgFps = this.getAverageFPS();
const currentFps = this.getCurrentFPS();
return {
fps: currentFps,
avgFps,
minFps: this.getMinFPS(),
maxFps: this.getMaxFPS(),
frameTime: currentFps > 0 ? 1000 / currentFps : 0,
memoryMB: this.getMemoryUsageMB(),
drawCalls: renderer?.info?.render?.calls ?? 0,
triangles: renderer?.info?.render?.triangles ?? 0,
};
}
/**
* Get current memory usage in MB (Chrome only)
*/
private getMemoryUsageMB(): number {
// eslint-disable-next-line @typescript-eslint/no-explicit-any -- Chrome-specific performance.memory API not in standard TS types
const perf = performance as any;
Iif (perf.memory) {
return perf.memory.usedJSHeapSize / 1024 / 1024;
}
return 0;
}
/**
* Check performance thresholds and log warnings
*/
private checkPerformanceThresholds(renderer?: THREE.WebGLRenderer): void {
this.performanceWarnings = [];
const avgFps = this.getAverageFPS();
const memoryMB = this.getMemoryUsageMB();
const drawCalls = renderer?.info?.render?.calls ?? 0;
// Check FPS
Iif (avgFps < this.thresholds.minAcceptableFps) {
const warning = `⚠️ FPS below threshold: ${avgFps.toFixed(1)} < ${
this.thresholds.minAcceptableFps
}`;
this.performanceWarnings.push(warning);
console.warn(warning);
}
// Check memory
Iif (memoryMB > 0 && memoryMB > this.thresholds.maxMemoryMB) {
const warning = `⚠️ Memory usage high: ${memoryMB.toFixed(1)}MB > ${
this.thresholds.maxMemoryMB
}MB`;
this.performanceWarnings.push(warning);
console.warn(warning);
}
// Check draw calls
Iif (drawCalls > this.thresholds.maxDrawCalls) {
const warning = `⚠️ Draw calls high: ${drawCalls} > ${this.thresholds.maxDrawCalls}`;
this.performanceWarnings.push(warning);
console.warn(warning);
}
}
/**
* Get current performance warnings
*/
getWarnings(): readonly string[] {
return this.performanceWarnings;
}
/**
* Reset all metrics
*/
reset(): void {
this.frames = [];
this.lastTime = performance.now();
this.frameCount = 0;
this.minFps = Infinity;
this.maxFps = 0;
this.performanceWarnings = [];
}
/**
* Get formatted performance summary string
*/
getSummary(renderer?: THREE.WebGLRenderer): string {
const metrics = this.getMetrics(renderer);
return (
`FPS: ${metrics.fps.toFixed(1)} | ` +
`Avg: ${metrics.avgFps.toFixed(1)} | ` +
`Min: ${metrics.minFps.toFixed(1)} | ` +
`Max: ${metrics.maxFps.toFixed(1)} | ` +
`Frame: ${metrics.frameTime.toFixed(2)}ms | ` +
`Mem: ${metrics.memoryMB.toFixed(1)}MB | ` +
`Draws: ${metrics.drawCalls} | ` +
`Tris: ${(metrics.triangles / 1000).toFixed(1)}k`
);
}
}
/**
* Create a performance monitor with optional custom thresholds
*/
export function createPerformanceMonitor(
thresholds?: Partial<PerformanceThresholds>,
): PerformanceMonitor {
return new PerformanceMonitor(thresholds);
}
export default PerformanceMonitor;
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