motion/dev/html/public/benchmarks/transform-rebuild-overhead.html at 196f464364b8972e769dd2cda1e72b3509035a5c · motiondivision/motion · GitHub

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<html>
    <!--
      Transform Rebuild Overhead Benchmark

      This benchmark measures the overhead of rebuilding transforms when
      animating non-transform properties. In the old renderer, animating
      backgroundColor would trigger a full transform string rebuild.
      With atomic updates, only backgroundColor would be updated.

      Phase 1: Animate x, y, scale, rotate, backgroundColor on 200 divs
      Phase 2 (after 1s): Animate only backgroundColor

      In the old renderer, Phase 2 still rebuilds transform strings.
      With atomic updates, Phase 2 only touches backgroundColor.
    -->
    <head>
        <style>
            body {
                padding: 0;
                margin: 0;
                font-family: system-ui, sans-serif;
            }

            .stats {
                position: fixed;
                top: 10px;
                left: 10px;
                background: rgba(0, 0, 0, 0.8);
                color: white;
                padding: 15px;
                border-radius: 8px;
                font-size: 14px;
                z-index: 1000;
            }

            .stats div {
                margin: 5px 0;
            }

            .container {
                padding: 20px;
                width: 100%;
                display: flex;
                flex-wrap: wrap;
                gap: 5px;
            }

            .box {
                width: 40px;
                height: 40px;
                background-color: #ff0000;
                border-radius: 4px;
            }
        </style>
    </head>
    <body>
        <div class="stats">
            <div>Phase: <span id="phase">Initializing...</span></div>
            <div>Boxes: <span id="boxCount">0</span></div>
            <div>FPS: <span id="fps">--</span></div>
            <div>Avg Frame Time: <span id="frameTime">--</span>ms</div>
        </div>
        <div class="container"></div>
        <script type="module" src="/src/imports/framer-motion-dom.js"></script>
        <script type="module">
            const { animate } = window.Motion

            const NUM_BOXES = 200
            const PHASE1_DURATION = 1000 // 1 second
            const PHASE2_DURATION = 2000 // 2 seconds

            // Create boxes
            let html = ``
            for (let i = 0; i < NUM_BOXES; i++) {
                html += `<div class="box"></div>`
            }
            document.querySelector(".container").innerHTML = html
            const boxes = document.querySelectorAll(".box")
            document.getElementById("boxCount").textContent = NUM_BOXES

            // FPS tracking
            let frameCount = 0
            let frameTimes = []
            let lastTime = performance.now()

            function trackFrame() {
                const now = performance.now()
                const delta = now - lastTime
                lastTime = now
                frameCount++
                frameTimes.push(delta)

                // Keep last 60 frames
                if (frameTimes.length > 60) {
                    frameTimes.shift()
                }

                // Update stats every 10 frames
                if (frameCount % 10 === 0) {
                    const avgFrameTime = frameTimes.reduce((a, b) => a + b, 0) / frameTimes.length
                    const fps = 1000 / avgFrameTime
                    document.getElementById("fps").textContent = fps.toFixed(1)
                    document.getElementById("frameTime").textContent = avgFrameTime.toFixed(2)
                }

                requestAnimationFrame(trackFrame)
            }

            // Start FPS tracking
            requestAnimationFrame(trackFrame)

            // Phase 1: Animate all properties
            document.getElementById("phase").textContent = "Phase 1: All properties (x, y, scale, rotate, backgroundColor)"

            const phase1Animations = []
            boxes.forEach((box, i) => {
                // Stagger the animations slightly for visual interest
                const delay = (i % 20) * 10

                phase1Animations.push(
                    animate(
                        box,
                        {
                            x: [0, 50, 0],
                            y: [0, 30, 0],
                            scale: [1, 1.2, 1],
                            rotate: [0, 180, 360],
                            backgroundColor: ["#ff0000", "#00ff00", "#0000ff", "#ff0000"],
                        },
                        {
                            duration: PHASE1_DURATION / 1000,
                            delay: delay / 1000,
                            ease: "easeInOut",
                        }
                    )
                )
            })

            // Phase 2: After 1 second, animate ONLY backgroundColor
            // This is where the overhead difference shows:
            // - Old renderer: rebuilds transform string on every backgroundColor change
            // - Atomic updates: only updates backgroundColor style property
            setTimeout(() => {
                document.getElementById("phase").textContent = "Phase 2: Only backgroundColor (transform overhead test)"

                // Reset frame tracking for phase 2
                frameTimes = []
                frameCount = 0

                boxes.forEach((box, i) => {
                    const delay = (i % 20) * 5

                    animate(
                        box,
                        {
                            backgroundColor: [
                                "#0000ff",
                                "#ff00ff",
                                "#00ffff",
                                "#ffff00",
                                "#ff0000",
                            ],
                        },
                        {
                            duration: PHASE2_DURATION / 1000,
                            delay: delay / 1000,
                            ease: "linear",
                            repeat: Infinity,
                        }
                    )
                })
            }, PHASE1_DURATION + 500)
        </script>
    </body>
</html>