diff --git a/components/canvas/world3d/World3DViewer.tsx b/components/canvas/world3d/World3DViewer.tsx
index 5b5bd5084..41339f96e 100644
--- a/components/canvas/world3d/World3DViewer.tsx
+++ b/components/canvas/world3d/World3DViewer.tsx
@@ -170,6 +170,13 @@ 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 SPARK_INLINE_LOD_BUILD_THRESHOLD = 180_000;
+const SPARK_INLINE_LOD_SPLAT_SCALE = 0.78;
+const SPARK_INLINE_LOD_RENDER_SCALE = 1.8;
+const SPARK_MINIMAL_FRAME_LOD_SPLAT_SCALE = 0.6;
+const SPARK_MINIMAL_FRAME_LOD_RENDER_SCALE = 2.4;
+const SPARK_MIN_SORT_INTERVAL_MS = 24;
+const SPARK_MINIMAL_FRAME_SORT_INTERVAL_MS = 40;
 
 const KEY_TO_MOVEMENT: Partial<Record<string, MovementCommand>> = {
   KeyW: "forward",
@@ -230,6 +237,7 @@ function buildSplatParticleCloudData(
   sampleLimit = SPLAT_PARTICLE_SAMPLE_LIMIT
 ): SplatParticleCloudData | null {
   const packedSplats = splatMesh.packedSplats;
+  if (!packedSplats) return null;
   const totalSplats = Math.max(0, packedSplats?.numSplats || 0);
   if (!totalSplats) return null;
 
@@ -303,6 +311,9 @@ function getSplatWorldBounds(splatMesh: SparkSplatMesh) {
 
 function getRobustSplatWorldBounds(splatMesh: SparkSplatMesh) {
   const packedSplats = splatMesh.packedSplats;
+  if (!packedSplats) {
+    return getSplatWorldBounds(splatMesh);
+  }
   const totalSplats = Math.max(0, packedSplats?.numSplats || 0);
   if (totalSplats < 32) {
     return getSplatWorldBounds(splatMesh);
@@ -679,15 +690,44 @@ function WorldSplatLoadingOverlay({
   phase: Exclude<SplatLoadingPhase, "hidden">;
 }) {
   const isRevealing = phase === "revealing";
+  const isLoading = phase === "loading";
 
   return (
     <>
-      {phase === "loading" ? (
+      {previewImageUrl ? (
+        <div
+          className={cn(
+            "pointer-events-none absolute inset-0 overflow-hidden transition-opacity duration-500",
+            isLoading ? "opacity-100" : "opacity-30"
+          )}
+        >
+          <img
+            alt="世界预览"
+            className={cn(
+              "absolute inset-0 h-full w-full object-cover transition-transform duration-700",
+              isLoading ? "scale-[1.01]" : "scale-100"
+            )}
+            decoding="async"
+            fetchPriority="high"
+            src={previewImageUrl}
+          />
+          <div
+            className={cn(
+              "absolute inset-0 transition-opacity duration-500",
+              isLoading
+                ? "bg-gradient-to-b from-black/10 via-black/12 to-black/30"
+                : "bg-gradient-to-b from-black/0 via-black/5 to-black/18"
+            )}
+          />
+        </div>
+      ) : phase === "loading" ? (
         <div className="pointer-events-none absolute inset-0 overflow-hidden transition-opacity duration-300">
           {previewImageUrl ? (
             <img
               alt="世界预览"
               className="absolute inset-0 h-full w-full object-cover opacity-[0.1] blur-[10px] saturate-[0.72]"
+              decoding="async"
+              fetchPriority="high"
               src={previewImageUrl}
             />
           ) : null}
@@ -703,11 +743,17 @@ function WorldSplatLoadingOverlay({
         <div className="rounded-2xl border border-white/10 bg-black/45 px-3 py-2 shadow-[0_20px_60px_rgba(0,0,0,0.38)] backdrop-blur-xl">
           <div className="flex items-center gap-2 text-[11px] text-zinc-100">
             <Sparkles className="h-3.5 w-3.5 text-cyan-200" />
-            <span>{isRevealing ? "世界数据正在聚合" : "正在载入世界数据"}</span>
+            <span>{isRevealing ? "高清世界正在接管预览" : "正在载入世界数据"}</span>
           </div>
           <div className="mt-1 flex items-center gap-2 text-[10px] text-zinc-400">
             <Loader2 className="h-3 w-3 animate-spin" />
-            <span>{isRevealing ? "当前世界正在从颗粒态恢复细节" : "空间数据准备中"}</span>
+            <span>
+              {isRevealing
+                ? "预览图已显示，世界细节正在补齐"
+                : previewImageUrl
+                  ? "先展示世界预览图，空间数据后台继续加载"
+                  : "空间数据准备中"}
+            </span>
           </div>
         </div>
       </div>
@@ -951,6 +997,7 @@ function WorldSplatScene({
   splatUrl,
   revealPhase = "loading",
   firstPerson = false,
+  minimalFrame = false,
   hotspots = [],
   interactionMode = "navigate",
   onPick,
@@ -964,6 +1011,7 @@ function WorldSplatScene({
   splatUrl: string;
   revealPhase?: SplatLoadingPhase;
   firstPerson?: boolean;
+  minimalFrame?: boolean;
   hotspots?: World3DHotspot[];
   interactionMode?: "navigate" | "hotspot";
   onPick?: (pick: World3DPickResult) => void;
@@ -996,17 +1044,36 @@ function WorldSplatScene({
         renderer,
         blurAmount: 0.18,
         maxStdDev: Math.sqrt(7),
-        originDistance: 0.85,
-        view: {
-          sortRadial: true,
-          sortDistance: 0.04,
-        },
+        sortRadial: true,
+        minSortIntervalMs: minimalFrame
+          ? SPARK_MINIMAL_FRAME_SORT_INTERVAL_MS
+          : SPARK_MIN_SORT_INTERVAL_MS,
+        enableLod: true,
+        enableLodFetching: false,
+        lodSplatScale: minimalFrame
+          ? SPARK_MINIMAL_FRAME_LOD_SPLAT_SCALE
+          : SPARK_INLINE_LOD_SPLAT_SCALE,
+        lodRenderScale: minimalFrame
+          ? SPARK_MINIMAL_FRAME_LOD_RENDER_SCALE
+          : SPARK_INLINE_LOD_RENDER_SCALE,
+        numLodFetchers: 2,
       }),
-    [renderer]
+    [minimalFrame, renderer]
   );
   const splatMesh = useMemo(
-    () => new SparkSplatMesh({ fileType: SplatFileType.SPZ, url: splatUrl }),
-    [splatUrl]
+    () =>
+      new SparkSplatMesh({
+        fileType: SplatFileType.SPZ,
+        url: splatUrl,
+        lod: true,
+        nonLod: true,
+        lodAbove: SPARK_INLINE_LOD_BUILD_THRESHOLD,
+        enableLod: true,
+        lodScale: minimalFrame
+          ? SPARK_MINIMAL_FRAME_LOD_SPLAT_SCALE
+          : SPARK_INLINE_LOD_SPLAT_SCALE,
+      }),
+    [minimalFrame, splatUrl]
   );
   const groundPlaneOffset =
     typeof semanticsMetadata?.ground_plane_offset === "number"
@@ -1023,6 +1090,7 @@ function WorldSplatScene({
     applySparkRevealProfile(sparkRenderer, splatMesh, SPLAT_NORMAL_PROFILE);
     return () => {
       sparkRenderer.removeFromParent();
+      sparkRenderer.dispose();
     };
   }, [sparkRenderer, splatMesh]);
 
@@ -1182,7 +1250,7 @@ function WorldSplatScene({
       applySparkRevealProfile(sparkRenderer, splatMesh, SPLAT_NORMAL_PROFILE);
     }
 
-    sparkRenderer.needsUpdate = true;
+    sparkRenderer.dirty = true;
   });
 
   const handlePointerDown = (event: ThreeEvent<PointerEvent>) => {
@@ -1428,12 +1496,12 @@ 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]}
+        dpr={minimalFrame ? [0.85, 1] : [1, 1]}
         frameloop="always"
         gl={{
           antialias: false,
           powerPreference: "high-performance",
-          preserveDrawingBuffer: true,
+          preserveDrawingBuffer: Boolean(onCaptureReady),
         }}
       >
         <WorldSplatCaptureBridge onCaptureReady={onCaptureReady} />
@@ -1441,6 +1509,7 @@ function WorldSplatViewer({
           firstPerson={firstPerson}
           hotspots={hotspots}
           interactionMode={interactionMode}
+          minimalFrame={minimalFrame}
           onHotspotSelect={onHotspotSelect}
           onLoadStateChange={setLoadState}
           onPick={onPick}
diff --git a/lib/worldlabs/splat-utils.ts b/lib/worldlabs/splat-utils.ts
index 4a1e14338..de522b6ae 100644
--- a/lib/worldlabs/splat-utils.ts
+++ b/lib/worldlabs/splat-utils.ts
@@ -59,7 +59,10 @@ export function pickBestWorldLabsSplatUrl(
   return pickBestWorldLabsSplatEntry(spzUrls)?.[1] || null;
 }
 
-const INLINE_WORLDLABS_SPLAT_TARGET_SCORE = 1_500_000;
+// World Labs exports multiple SPZ tiers (for example 100k / 500k / full).
+// For embedded previews we bias hard toward the lightweight tier so users see
+// the world quickly, then can switch to imagery / mesh for detail if needed.
+const INLINE_WORLDLABS_SPLAT_TARGET_SCORE = 100_000;
 
 function pickClosestResolutionEntry(
   entries: Array<[string, string]>,
diff --git a/package.json b/package.json
index 395d04358..1c6f9610e 100644
--- a/package.json
+++ b/package.json
@@ -60,7 +60,7 @@
     "@radix-ui/react-visually-hidden": "^1.1.0",
     "@react-three/drei": "^10.7.7",
     "@react-three/fiber": "^9.5.0",
-    "@sparkjsdev/spark": "^0.1.10",
+    "@sparkjsdev/spark": "^2.0.0",
     "@tanstack/react-virtual": "^3.13.24",
     "@types/form-data": "^2.5.2",
     "@vercel/analytics": "^1.3.1",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index ae35ac2c2..907377271 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -129,8 +129,8 @@ importers:
         specifier: ^9.5.0
         version: 9.5.0(@types/react@18.3.18)(immer@11.1.3)(react-dom@19.0.0-rc-45804af1-20241021(react@19.0.0-rc-45804af1-20241021))(react@19.0.0-rc-45804af1-20241021)(three@0.182.0)
       '@sparkjsdev/spark':
-        specifier: ^0.1.10
-        version: 0.1.10
+        specifier: ^2.0.0
+        version: 2.0.0(three@0.182.0)
       '@tanstack/react-virtual':
         specifier: ^3.13.24
         version: 3.13.24(react-dom@19.0.0-rc-45804af1-20241021(react@19.0.0-rc-45804af1-20241021))(react@19.0.0-rc-45804af1-20241021)
@@ -2977,8 +2977,10 @@ packages:
     resolution: {integrity: sha512-4aUIteuyxtBUhVdiQqcDhKFitwfd9hqoSDYY2KRXiWtgoWJ9Bmise+KfEPDiVHWeJepvF8xJO9/9+WDIciMFFw==}
     engines: {node: '>=18.0.0'}
 
-  '@sparkjsdev/spark@0.1.10':
-    resolution: {integrity: sha512-CiijdZQuj7KPDUqIZPiEqyUkJCYo1JqR05vq/V+ElxMwqR7L70ZuZDyIKcasjZHSiPB8pGRMH8HZGqUKO9aRPQ==}
+  '@sparkjsdev/spark@2.0.0':
+    resolution: {integrity: sha512-W1p7NM4xXcUAVVcVus2mIFwcAC3VckyE0l4wXJuSmhcOgb6hHpqhQ/Ks9MK9ts7j23K+UwbCBwe+aTc/zgGygw==}
+    peerDependencies:
+      three: ^0.180.0
 
   '@standard-schema/spec@1.0.0':
     resolution: {integrity: sha512-m2bOd0f2RT9k8QJx1JN85cZYyH1RqFBdlwtkSlf4tBDYLCiiZnv1fIIwacK6cqwXavOydf0NPToMQgpKq+dVlA==}
@@ -9424,9 +9426,10 @@ snapshots:
     dependencies:
       tslib: 2.8.1
 
-  '@sparkjsdev/spark@0.1.10':
+  '@sparkjsdev/spark@2.0.0(three@0.182.0)':
     dependencies:
       fflate: 0.8.2
+      three: 0.182.0
 
   '@standard-schema/spec@1.0.0': {}