perf: speed up world viewer loading

app/api/canvas/3d/model-proxy/route.ts

@@ -4,6 +4,8 @@ import { buildThreeAssetUrl } from "@/lib/canvas/three-asset-url";
 
 export const runtime = "nodejs";
 export const maxDuration = 60;
+const THREE_ASSET_BROWSER_CACHE_CONTROL =
+  "private, max-age=86400, stale-while-revalidate=604800";
 
 function isAllowedModelHost(hostname: string) {
   const normalized = hostname.toLowerCase();
@@ -144,7 +146,13 @@ export async function GET(request: Request) {
     const acceptRanges = upstream.headers.get("accept-ranges");
     if (acceptRanges) responseHeaders.set("accept-ranges", acceptRanges);
 
-    responseHeaders.set("cache-control", "private, no-store");
+    const etag = upstream.headers.get("etag");
+    if (etag) responseHeaders.set("etag", etag);
+
+    const lastModified = upstream.headers.get("last-modified");
+    if (lastModified) responseHeaders.set("last-modified", lastModified);
+
+    responseHeaders.set("cache-control", THREE_ASSET_BROWSER_CACHE_CONTROL);
 
     if (shouldRewriteGltf) {
       const rewrittenPayload = rewriteGltfPayload(await upstream.text(), targetUrl);

app/canvas/[id]/model3d/page.tsx

@@ -91,6 +91,7 @@ import { cn, fetcher } from "@/lib/utils";
 import {
   getSortedWorldLabsSplatEntries,
   pickBestArchivedWorldLabsSplatUrl,
+  pickPreferredInlineWorldLabsSplatUrl,
 } from "@/lib/worldlabs/splat-utils";
 import {
   DEFAULT_PUBLIC_THREED_MODEL_ALIAS_CONFIG,
@@ -2605,7 +2606,10 @@ export default function CanvasModel3DPage() {
       ? buildWorldShareUrl(currentTask.shareToken)
       : null;
   const currentSpzEntries = getSortedWorldLabsSplatEntries(currentWorldAsset?.spzUrls);
-  const currentPrimarySpzUrl = currentSpzEntries[0]?.[1] || null;
+  const currentPrimarySpzUrl =
+    pickPreferredInlineWorldLabsSplatUrl(currentWorldAsset?.spzUrls) ||
+    currentSpzEntries[0]?.[1] ||
+    null;
   const currentWorldImageUrl =
     currentWorldAsset?.panoUrl ||
     currentWorldAsset?.thumbnailUrl ||

app/worlds/share/[token]/page.tsx

@@ -3,7 +3,7 @@ import { notFound } from "next/navigation";
 import { WorldSharePage } from "@/components/canvas/world3d/WorldSharePage";
 import { db } from "@/lib/db";
 import { model3dAsset } from "@/lib/db/schema";
-import { pickBestArchivedWorldLabsSplatUrl } from "@/lib/worldlabs/splat-utils";
+import { pickPreferredInlineWorldLabsSplatUrl } from "@/lib/worldlabs/splat-utils";
 
 export const dynamic = "force-dynamic";
 
@@ -86,7 +86,7 @@ export default async function SharedWorldPage({
       previewImageUrl: asset.previewImageUrl || assetPayload?.thumbnailUrl || null,
       prompt: asset.prompt || null,
       semanticsMetadata: assetPayload?.semanticsMetadata || null,
-      splatUrl: pickBestArchivedWorldLabsSplatUrl(assetPayload?.spzUrls),
+      splatUrl: pickPreferredInlineWorldLabsSplatUrl(assetPayload?.spzUrls),
       title: assetPayload?.displayName || asset.prompt || `World ${asset.taskId.slice(0, 8)}`,
       worldUrl: assetPayload?.worldUrl || null,
     };

components/canvas/nodes/World3DNode.tsx

@@ -35,6 +35,7 @@ import {
 import {
   isArchivedWorldLabsAssetUrl,
   pickBestArchivedWorldLabsSplatUrl,
+  pickPreferredInlineWorldLabsSplatUrl,
 } from "@/lib/worldlabs/splat-utils";
 import { getNodeContentScale } from "@/lib/canvas/node-content-scale";
 import {
@@ -201,9 +202,17 @@ export function World3DNode({
 
   const activeView = useMemo(() => resolveActiveView(data), [data]);
   const availableViews = useMemo(() => resolveAvailableViews(data), [data]);
-  const renderableSplatUrl = isArchivedWorldLabsAssetUrl(data.splatUrl)
-    ? data.splatUrl
-    : undefined;
+  const renderableSplatUrl = useMemo(() => {
+    const assetPayloadSplatUrl = pickPreferredInlineWorldLabsSplatUrl(
+      metadataAssetPayload.spzUrls as Record<string, string> | null | undefined
+    );
+
+    if (isArchivedWorldLabsAssetUrl(assetPayloadSplatUrl)) {
+      return assetPayloadSplatUrl;
+    }
+
+    return isArchivedWorldLabsAssetUrl(data.splatUrl) ? data.splatUrl : undefined;
+  }, [data.splatUrl, metadataAssetPayload.spzUrls]);
   const renderableMeshUrl = isArchivedWorldLabsAssetUrl(data.meshUrl)
     ? data.meshUrl
     : undefined;

components/canvas/world3d/World3DViewer.tsx

@@ -166,8 +166,10 @@ function lerpSparkRevealProfile(
   };
 }
 
-const SPLAT_REVEAL_DURATION_MS = 2600;
-const SPLAT_PARTICLE_SAMPLE_LIMIT = 1800;
+const SPLAT_REVEAL_DURATION_MS = 900;
+const SPLAT_PARTICLE_SAMPLE_LIMIT = 720;
+const SPLAT_WORLD_BOUNDS_SAMPLE_LIMIT = 1200;
+const SPLAT_FAST_LOAD_SKIP_REVEAL_MS = 1200;
 
 const KEY_TO_MOVEMENT: Partial<Record<string, MovementCommand>> = {
   KeyW: "forward",
@@ -307,7 +309,7 @@ function getRobustSplatWorldBounds(splatMesh: SparkSplatMesh) {
   }
 
   splatMesh.updateMatrixWorld(true);
-  const targetCount = Math.min(totalSplats, 3200);
+  const targetCount = Math.min(totalSplats, SPLAT_WORLD_BOUNDS_SAMPLE_LIMIT);
   const sampleStep = Math.max(Math.floor(totalSplats / targetCount), 1);
   const point = new THREE.Vector3();
   const xs: number[] = [];
@@ -1063,16 +1065,16 @@ function WorldSplatScene({
           onLoadStateChange?.("ready");
 
           const buildParticleCloud = () => {
-            if (cancelled) return;
+            if (cancelled || revealPhaseRef.current === "hidden") return;
             setParticleCloudData(buildSplatParticleCloudData(splatMesh));
           };
 
           if ("requestIdleCallback" in window) {
             idleCallbackId = window.requestIdleCallback(buildParticleCloud, {
-              timeout: 900,
+              timeout: 250,
             });
           } else {
-            timeoutId = globalThis.setTimeout(buildParticleCloud, 120);
+            timeoutId = globalThis.setTimeout(buildParticleCloud, 160);
           }
         });
       })
@@ -1364,15 +1366,20 @@ function WorldSplatViewer({
   const [loadState, setLoadState] = useState<"loading" | "ready" | "error">("loading");
   const [overlayPhase, setOverlayPhase] = useState<SplatLoadingPhase>("loading");
   const resolvedSplatUrl = useMemo(() => buildThreeAssetUrl(splatUrl), [splatUrl]);
+  const loadStartedAtRef = useRef(0);
 
   useEffect(() => {
+    loadStartedAtRef.current = performance.now();
     setLoadState("loading");
     setOverlayPhase("loading");
   }, [resolvedSplatUrl]);
 
   useEffect(() => {
     if (loadState === "ready") {
-      setOverlayPhase("revealing");
+      const elapsed = performance.now() - loadStartedAtRef.current;
+      setOverlayPhase(
+        elapsed <= SPLAT_FAST_LOAD_SKIP_REVEAL_MS ? "hidden" : "revealing"
+      );
     }
 
     if (loadState === "loading") {
@@ -1421,8 +1428,13 @@ function WorldSplatViewer({
       <Canvas
         camera={{ position: [0, 1.6, 4], fov: 55 }}
         className="h-full w-full bg-[radial-gradient(circle_at_top,_rgba(15,23,42,0.95),_rgba(1,1,1,1)_68%)]"
+        dpr={[1, 1.25]}
         frameloop="always"
-        gl={{ antialias: false, preserveDrawingBuffer: true }}
+        gl={{
+          antialias: false,
+          powerPreference: "high-performance",
+          preserveDrawingBuffer: true,
+        }}
       >
         <WorldSplatCaptureBridge onCaptureReady={onCaptureReady} />
         <WorldSplatScene

lib/worldlabs/splat-utils.ts

@@ -59,6 +59,40 @@ export function pickBestWorldLabsSplatUrl(
   return pickBestWorldLabsSplatEntry(spzUrls)?.[1] || null;
 }
 
+const INLINE_WORLDLABS_SPLAT_TARGET_SCORE = 1_500_000;
+
+function pickClosestResolutionEntry(
+  entries: Array<[string, string]>,
+  targetScore: number
+) {
+  if (!entries.length) return null;
+
+  const scoredEntries = entries
+    .map((entry) => ({
+      entry,
+      score: parseResolutionScore(entry[0]),
+    }))
+    .filter(
+      (item) =>
+        Number.isFinite(item.score) &&
+        item.score > 0 &&
+        item.score !== Number.MAX_SAFE_INTEGER
+    );
+
+  if (!scoredEntries.length) {
+    return entries[0] || null;
+  }
+
+  return scoredEntries
+    .slice()
+    .sort((left, right) => {
+      const distanceDelta =
+        Math.abs(left.score - targetScore) - Math.abs(right.score - targetScore);
+      if (distanceDelta !== 0) return distanceDelta;
+      return left.score - right.score;
+    })[0]?.entry || null;
+}
+
 const KNOWN_ARCHIVED_ASSET_HOSTS = [
   "blob.vercel-storage.com",
   "s3.1080p.hk",
@@ -129,3 +163,26 @@ export function pickBestArchivedWorldLabsSplatUrl(
 ) {
   return getArchivedWorldLabsSplatEntries(spzUrls)[0]?.[1] || null;
 }
+
+export function pickPreferredInlineWorldLabsSplatEntry(
+  spzUrls?: Record<string, string> | null
+) {
+  const archivedEntries = getArchivedWorldLabsSplatEntries(spzUrls);
+  if (archivedEntries.length > 0) {
+    return pickClosestResolutionEntry(
+      archivedEntries,
+      INLINE_WORLDLABS_SPLAT_TARGET_SCORE
+    );
+  }
+
+  return pickClosestResolutionEntry(
+    getSortedWorldLabsSplatEntries(spzUrls),
+    INLINE_WORLDLABS_SPLAT_TARGET_SCORE
+  );
+}
+
+export function pickPreferredInlineWorldLabsSplatUrl(
+  spzUrls?: Record<string, string> | null
+) {
+  return pickPreferredInlineWorldLabsSplatEntry(spzUrls)?.[1] || null;
+}