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Improvement in performance #272

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Obrempong-1 merged 1 commit into from
Oct 20, 2026
Merged

Improvement in performance #272

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98 changes: 73 additions & 25 deletions components/home/HeroSection.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -49,7 +49,7 @@ function measureBand(
bend: number
): BandLayout {
const slices = 12;
const round = (n: number) => +n.toFixed(4);
const round = (n: number) => +n.toFixed(1);

const narrow = stacked;
const widest = narrow ? 76 : MAX_TILE_WIDTH;
Expand Down Expand Up @@ -176,7 +176,8 @@ const HeroSection = ({
const bandId = useId().replace(/[^a-zA-Z0-9]/g, '');
const bend = (Math.min(85, Math.max(5, BAND.curve)) * Math.PI) / 180;
const [layout, setLayout] = useState<BandLayout | null>(null);
const [shown, setShown] = useState<Record<number, number>>({});
const [ready, setReady] = useState(false);
const shots = useRef(new Map<number, HTMLImageElement[]>());

const tiles = useMemo(
() =>
Expand Down Expand Up @@ -233,26 +234,45 @@ const HeroSection = ({
);
};

const observer = new ResizeObserver(read);
let queued = 0;
const schedule = () => {
if (queued) return;
queued = requestAnimationFrame(() => {
queued = 0;
read();
});
};

const observer = new ResizeObserver(schedule);
observer.observe(hero);
if (contentRef.current) observer.observe(contentRef.current);
if (ledeRef.current) observer.observe(ledeRef.current);

document.fonts?.ready.then(read).catch(() => {});
const settle = () => {
read();
setReady(true);
};
if (document.fonts?.ready) document.fonts.ready.then(settle).catch(settle);
else settle();

return () => observer.disconnect();
return () => {
if (queued) cancelAnimationFrame(queued);
observer.disconnect();
};
}, [variant, bend]);

const band = layout ?? measureBand(1200, 560, 200, 560, false, bend);
const cycles = tiles.length > band.columns;

useEffect(() => {
if (variant !== 'band') return;
for (const tile of tiles.slice(0, band.columns)) {
for (const tile of tiles) {
const preload = new window.Image();
if (tile.srcSet) preload.srcset = tile.srcSet;
preload.src = tile.src;
preload.decode?.().catch(() => {});
}
}, [variant, tiles, band.columns]);
}, [variant, tiles]);

const titleParts = title && highlight ? title.split(highlight) : [title ?? ''];

Expand All @@ -272,25 +292,35 @@ const HeroSection = ({
};

const orbit = `hero-orbit-${bandId}`;
const peek = `hero-peek-${bandId}`;
const tileClass = `hero-tile-${bandId}`;
const radiusPct = 100 * arc(bend);
const radius = `${+radiusPct.toFixed(3)}cqw`;
const unitOf = (n: number) => `calc(${+n.toFixed(4)} * ${band.tilePct}cqh)`;
const turn = (degrees: number) =>
`translateZ(${radius}) rotateY(${+degrees.toFixed(4)}deg) translateZ(-${radius})`;
const vanish = +(((band.sweep - band.limit) / (2 * band.sweep || 1)) * 100).toFixed(4);
const unitOf = (n: number) => `calc(${+n.toFixed(4)} * var(--band-tile))`;
const vanish = +(((band.sweep - band.limit) / (2 * band.sweep || 1)) * 100).toFixed(1);
const duration = band.columns * BAND.speed;
const share = BAND.aspect / band.slices;
const bandMask = `linear-gradient(90deg,transparent,#000 ${BAND.fade}%,#000 ${100 - BAND.fade}%,transparent)`;
const sliceMask =
'linear-gradient(to bottom,transparent 0%,rgba(0,0,0,0.65) 7%,#000 20%,#000 80%,rgba(0,0,0,0.65) 93%,transparent 100%)';
const bandCss =

const orbitCss =
`@keyframes ${orbit}{` +
`from{transform:${turn(-band.sweep)}}to{transform:${turn(band.sweep)}}` +
`0%,${vanish}%,${100 - vanish}%,100%{visibility:hidden}` +
`${vanish + 0.001}%,${100 - vanish - 0.001}%{visibility:visible}}` +
`from{transform:translateZ(var(--band-r)) rotateY(var(--band-from)) translateZ(calc(-1 * var(--band-r)))}` +
`to{transform:translateZ(var(--band-r)) rotateY(var(--band-to)) translateZ(calc(-1 * var(--band-r)))}}` +
`@media(prefers-reduced-motion:reduce){.${tileClass}{animation-play-state:paused}}`;

const peekCss =
`@keyframes ${peek}{` +
`0%,${vanish}%,${100 - vanish}%,100%{visibility:hidden}` +
`${vanish + 0.1}%,${100 - vanish - 0.1}%{visibility:visible}}`;

const bandVars = {
'--band-r': `${+radiusPct.toFixed(3)}cqw`,
'--band-from': `${-band.sweep}deg`,
'--band-to': `${band.sweep}deg`,
'--band-tile': `${band.tilePct}cqh`,
} as React.CSSProperties;

return (
<div
ref={bandRef}
Expand All @@ -304,12 +334,14 @@ const HeroSection = ({

{variant === 'band' ? (
<>
<style>{bandCss}</style>
<style>{orbitCss}</style>
<style>{peekCss}</style>
<div
aria-hidden
className='pointer-events-none absolute inset-0 transition-opacity duration-500'
style={{
opacity: layout ? 1 : 0,
...bandVars,
opacity: layout && ready ? 1 : 0,
perspective: `${+(radiusPct * CAMERA).toFixed(3)}cqw`,
perspectiveOrigin: `50% ${band.axis}%`,
maskImage: bandMask,
Expand All @@ -318,7 +350,7 @@ const HeroSection = ({
>
{Array.from({ length: band.columns }, (_, t) => {
const first = band.columns - 1 - t;
const tile = tiles[(shown[t] ?? first) % Math.max(tiles.length, 1)];
const tile = tiles[first % Math.max(tiles.length, 1)];

return (
<div
Expand All @@ -330,16 +362,24 @@ const HeroSection = ({
width: unitOf(BAND.aspect),
height: unitOf(1),
transformStyle: 'preserve-3d',
animation: `${orbit} ${duration}s linear ${-t * BAND.speed}s infinite`,
willChange: 'transform',
animation:
`${orbit} ${duration}s linear ${-t * BAND.speed}s infinite,` +
`${peek} ${duration}s linear ${-t * BAND.speed}s infinite`,
}}
onAnimationIteration={
cycles
? (event) => {
if (event.animationName !== orbit) return;
const lap = Math.round(event.elapsedTime / duration);
setShown((prev) => {
const next = lap * band.columns + first;
return prev[t] === next ? prev : { ...prev, [t]: next };
});
const next = tiles[(lap * band.columns + first) % tiles.length];
if (!next) return;
for (const node of shots.current.get(t) ?? []) {
if (node.src !== next.src) {
node.srcset = next.srcSet || '';
node.src = next.src;
}
}
}
: undefined
}
Expand All @@ -358,11 +398,19 @@ const HeroSection = ({
? unitOf(share)
: `calc(${unitOf(share)} + 1px)`,
height: unitOf(1),
transform: turn((BAND.aspect / 2 - (k + 0.5) * share) * band.unit),
transform:
`translateZ(var(--band-r)) ` +
`rotateY(${+((BAND.aspect / 2 - (k + 0.5) * share) * band.unit).toFixed(4)}deg) ` +
`translateZ(calc(-1 * var(--band-r)))`,
}}
>
{tile ? (
<img
ref={(node) => {
const row = shots.current.get(t) ?? [];
if (node) row[k] = node;
shots.current.set(t, row);
}}
src={tile.src}
srcSet={tile.srcSet || undefined}
sizes='(max-width: 768px) 55vw, 30vw'
Expand Down
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