diff --git a/electron/ipc/export/native-video.test.ts b/electron/ipc/export/native-video.test.ts
index ad4079c3..5960a3e4 100644
--- a/electron/ipc/export/native-video.test.ts
+++ b/electron/ipc/export/native-video.test.ts
@@ -59,6 +59,7 @@ import {
 	getNativeStaticLayoutSourceProxyBitrate,
 	getNvidiaCudaAudioExportSkipReason,
 	getNvidiaCudaAutoStallTimeoutMs,
+	hasNativeStaticLayoutProgressAdvanced,
 	hasNvidiaGpuDeviceInGpuInfo,
 	mapNvidiaCudaWrapperProgressPercentage,
 	muxExportedVideoAudioBuffer,
@@ -1134,6 +1135,37 @@ describe("mapNvidiaCudaWrapperProgressPercentage", () => {
 	});
 });
 
+describe("hasNativeStaticLayoutProgressAdvanced", () => {
+	it("treats repeated preparation heartbeats as stalled until real progress arrives", () => {
+		const previous = { currentFrame: 0, percentage: 2.5 };
+
+		expect(
+			hasNativeStaticLayoutProgressAdvanced(
+				{ currentFrame: 0, totalFrames: 100, percentage: 2.5, stage: "preparing" },
+				previous,
+			),
+		).toBe(false);
+		expect(
+			hasNativeStaticLayoutProgressAdvanced(
+				{ currentFrame: 0, totalFrames: 100, percentage: 2.7, stage: "preparing" },
+				previous,
+			),
+		).toBe(true);
+		expect(
+			hasNativeStaticLayoutProgressAdvanced(
+				{ currentFrame: 1, totalFrames: 100, percentage: 2.5 },
+				previous,
+			),
+		).toBe(true);
+		expect(
+			hasNativeStaticLayoutProgressAdvanced(
+				{ currentFrame: 100, totalFrames: 100, percentage: 97.25, stage: "finalizing" },
+				{ currentFrame: 100, percentage: 97.25 },
+			),
+		).toBe(true);
+	});
+});
+
 describe("parseNativeVideoMetadataProbeOutput", () => {
 	it("parses FFmpeg input metadata with video and audio streams", () => {
 		const metadata = parseNativeVideoMetadataProbeOutput(`
diff --git a/electron/ipc/export/native-video.ts b/electron/ipc/export/native-video.ts
index 7b304220..56cd2974 100644
--- a/electron/ipc/export/native-video.ts
+++ b/electron/ipc/export/native-video.ts
@@ -635,6 +635,7 @@ async function persistNvidiaCudaExportDiagnostics(params: {
 	stderr: string;
 	stdout: string;
 	summary: NvidiaCudaExportSummary | null;
+	timedOut: boolean;
 }) {
 	if (!shouldPersistNvidiaCudaExportDiagnostics()) {
 		return;
@@ -651,6 +652,7 @@ async function persistNvidiaCudaExportDiagnostics(params: {
 		outputPath: params.outputPath,
 		exitCode: params.code,
 		signal: params.signal,
+		timedOut: params.timedOut,
 		args: params.args,
 		summary: params.summary,
 	};
@@ -852,6 +854,24 @@ export function mapNvidiaCudaWrapperProgressPercentage(progress: NativeStaticLay
 	return progress.percentage;
 }
 
+export function hasNativeStaticLayoutProgressAdvanced(
+	progress: { currentFrame: number; percentage: number; stage?: string },
+	previous: { currentFrame: number; percentage: number; stage?: string },
+) {
+	const currentFrame = Math.max(0, Math.floor(progress.currentFrame));
+	const percentage =
+		typeof progress.percentage === "number" && Number.isFinite(progress.percentage)
+			? progress.percentage
+			: 0;
+	if (currentFrame > previous.currentFrame) {
+		return true;
+	}
+	if (percentage > previous.percentage + 0.1) {
+		return true;
+	}
+	return progress.stage === "finalizing" && previous.stage !== "finalizing";
+}
+
 function startNativeStaticLayoutExportPowerGuard() {
 	try {
 		const blockerId = powerSaveBlocker.start("prevent-app-suspension");
@@ -2706,6 +2726,11 @@ async function runExperimentalNvidiaCudaStaticLayoutExport(
 		let stderr = "";
 		let stderrLineBuffer = "";
 		let lastProgressPercentage = 0;
+		let lastProgressForStallGuard: {
+			currentFrame: number;
+			percentage: number;
+			stage?: string;
+		} = { currentFrame: -1, percentage: -1 };
 		let stallTimedOut = false;
 		let settled = false;
 		const timeout = setTimeout(() => {
@@ -2734,11 +2759,9 @@ async function runExperimentalNvidiaCudaStaticLayoutExport(
 
 		child.stdout.on("data", (chunk: Buffer) => {
 			stdout += chunk.toString();
-			armStallTimeout();
 		});
 		child.stderr.on("data", (chunk: Buffer) => {
 			const text = chunk.toString();
-			armStallTimeout();
 			stderr += text;
 			stderrLineBuffer += text;
 			const lines = stderrLineBuffer.split(/\r?\n/);
@@ -2759,6 +2782,20 @@ async function runExperimentalNvidiaCudaStaticLayoutExport(
 							: undefined;
 				const mappedPercentage = mapNvidiaCudaWrapperProgressPercentage(progress);
 				lastProgressPercentage = Math.max(lastProgressPercentage, mappedPercentage);
+				const progressForStallGuard = {
+					currentFrame: progress.currentFrame,
+					percentage: mappedPercentage,
+					stage: progress.stage,
+				};
+				if (
+					hasNativeStaticLayoutProgressAdvanced(
+						progressForStallGuard,
+						lastProgressForStallGuard,
+					)
+				) {
+					lastProgressForStallGuard = progressForStallGuard;
+					armStallTimeout();
+				}
 				onProgress?.({
 					...progress,
 					percentage: lastProgressPercentage,
@@ -2825,13 +2862,14 @@ async function runExperimentalNvidiaCudaStaticLayoutExport(
 				stderr,
 				stdout,
 				summary,
+				timedOut: stallTimedOut,
 			});
 			if (code !== 0 || !summary?.success) {
 				const suffix = signal ? ` (signal ${signal})` : "";
 				reject(
 					new Error(
 						(stallTimedOut && stallTimeoutMs
-							? `Experimental NVIDIA CUDA exporter stalled for ${stallTimeoutMs}ms without output`
+							? `Experimental NVIDIA CUDA exporter stalled for ${stallTimeoutMs}ms without progress`
 							: stderr.trim()) ||
 							stdout.trim() ||
 							`Experimental NVIDIA CUDA exporter exited with code ${code ?? "unknown"}${suffix}`,
@@ -2884,6 +2922,11 @@ async function runExperimentalWindowsGpuStaticLayoutExport(
 		let stdout = "";
 		let stderr = "";
 		let stderrLineBuffer = "";
+		let lastProgressForStallGuard: {
+			currentFrame: number;
+			percentage: number;
+			stage?: string;
+		} = { currentFrame: -1, percentage: -1 };
 		let stallTimedOut = false;
 		let settled = false;
 		const timeout = setTimeout(() => {
@@ -2912,11 +2955,9 @@ async function runExperimentalWindowsGpuStaticLayoutExport(
 
 		child.stdout.on("data", (chunk: Buffer) => {
 			stdout += chunk.toString();
-			armStallTimeout();
 		});
 		child.stderr.on("data", (chunk: Buffer) => {
 			const text = chunk.toString();
-			armStallTimeout();
 			stderr += text;
 			stderrLineBuffer += text;
 			const lines = stderrLineBuffer.split(/\r?\n/);
@@ -2926,6 +2967,14 @@ async function runExperimentalWindowsGpuStaticLayoutExport(
 				if (!progress) {
 					continue;
 				}
+				if (hasNativeStaticLayoutProgressAdvanced(progress, lastProgressForStallGuard)) {
+					lastProgressForStallGuard = {
+						currentFrame: progress.currentFrame,
+						percentage: progress.percentage,
+						stage: progress.stage,
+					};
+					armStallTimeout();
+				}
 				const elapsedMs = Math.max(0, getNowMs() - startedAt);
 				onProgress?.({
 					...progress,
@@ -2983,7 +3032,7 @@ async function runExperimentalWindowsGpuStaticLayoutExport(
 				reject(
 					new Error(
 						(stallTimedOut && stallTimeoutMs
-							? `Experimental Windows GPU exporter stalled for ${stallTimeoutMs}ms without output`
+							? `Experimental Windows GPU exporter stalled for ${stallTimeoutMs}ms without progress`
 							: stderr.trim()) ||
 							stdout.trim() ||
 							`Experimental Windows GPU exporter exited with code ${code ?? "unknown"}${suffix}`,
diff --git a/src/lib/exporter/modernVideoExporter.nativeStaticLayout.test.ts b/src/lib/exporter/modernVideoExporter.nativeStaticLayout.test.ts
index 1ea75f84..6350de2e 100644
--- a/src/lib/exporter/modernVideoExporter.nativeStaticLayout.test.ts
+++ b/src/lib/exporter/modernVideoExporter.nativeStaticLayout.test.ts
@@ -261,7 +261,7 @@ describe("ModernVideoExporter native static-layout eligibility", () => {
 		});
 	});
 
-	it("reports video backgrounds before speed timeline gating", () => {
+	it("reports video backgrounds while speed can use native timeline maps", () => {
 		const exporter = createExporter({
 			wallpaper: "file:///C:/Recordly/background.webm",
 			speedRegions: [{ id: "speed-1", startMs: 1_000, endMs: 4_000, speed: 1.5 }],
@@ -303,7 +303,6 @@ describe("ModernVideoExporter native static-layout eligibility", () => {
 		).toEqual([
 			"odd-output-dimensions",
 			"unsupported-background-video",
-			"native-speed-timeline-validation-pending",
 			"unsupported-annotation-overlay",
 			"unsupported-caption-overlay",
 			"unsupported-webcam-source",
@@ -427,6 +426,24 @@ describe("ModernVideoExporter native static-layout eligibility", () => {
 		).toBe("native-timeline-requires-windows-gpu");
 	});
 
+	it("requires the Windows GPU compositor for speed timelines", () => {
+		const speedRegions: SpeedRegion[] = [
+			{ id: "speed-1", startMs: 1_000, endMs: 4_000, speed: 1.5 },
+		];
+		const exporter = createExporter({ experimentalNativeExport: false, speedRegions });
+
+		expect(
+			exporter.getNativeStaticLayoutSkipReason(
+				{
+					audioMode: "edited-track",
+					strategy: "offline-render-fallback",
+				},
+				videoInfo,
+				59,
+			),
+		).toBe("native-timeline-requires-windows-gpu");
+	});
+
 	it("uses speed timeline duration during native static-layout preflight", () => {
 		const speedRegions: SpeedRegion[] = [
 			{ id: "speed-1", startMs: 1_000, endMs: 4_000, speed: 1.5 },
@@ -436,12 +453,59 @@ describe("ModernVideoExporter native static-layout eligibility", () => {
 		expect(exporter.getNativeStaticLayoutEffectiveDuration(videoInfo)).toBeCloseTo(59, 3);
 	});
 
-	it("skips native speed timelines while compositor validation is pending", () => {
+	it("builds native timeline maps for the editor speed range endpoints", () => {
+		const speedRegions: SpeedRegion[] = [
+			{ id: "speed-1", startMs: 1_000, endMs: 2_000, speed: 0.25 },
+			{ id: "speed-2", startMs: 4_000, endMs: 5_000, speed: 30 },
+		];
+		const exporter = createExporter({ speedRegions });
+
+		expect(
+			exporter
+				.buildNativeStaticLayoutVideoTimelineSegments(videoInfo)
+				.map((segment) => segment.speed),
+		).toEqual([1, 0.25, 1, 30, 1]);
+		expect(
+			exporter.getNativeStaticLayoutSkipReason(
+				{
+					audioMode: "edited-track",
+					strategy: "offline-render-fallback",
+				},
+				videoInfo,
+				63.033,
+			),
+		).toBeNull();
+	});
+
+	it("allows native speed timelines through the Windows GPU timeline map", () => {
 		const speedRegions: SpeedRegion[] = [
 			{ id: "speed-1", startMs: 1_000, endMs: 4_000, speed: 1.5 },
 		];
 		const exporter = createExporter({ speedRegions });
 
+		expect(exporter.buildNativeStaticLayoutVideoTimelineSegments(videoInfo)).toEqual([
+			{
+				sourceStartMs: 0,
+				sourceEndMs: 1_000,
+				outputStartMs: 0,
+				outputEndMs: 1_000,
+				speed: 1,
+			},
+			{
+				sourceStartMs: 1_000,
+				sourceEndMs: 4_000,
+				outputStartMs: 1_000,
+				outputEndMs: 3_000,
+				speed: 1.5,
+			},
+			{
+				sourceStartMs: 4_000,
+				sourceEndMs: 60_000,
+				outputStartMs: 3_000,
+				outputEndMs: 59_000,
+				speed: 1,
+			},
+		]);
 		expect(
 			exporter.getNativeStaticLayoutSkipReason(
 				{
@@ -451,12 +515,12 @@ describe("ModernVideoExporter native static-layout eligibility", () => {
 				videoInfo,
 				60,
 			),
-		).toBe("native-speed-timeline-validation-pending");
+		).toBeNull();
 	});
 
-	it("rejects native static-layout when speed edits do not have a native timeline map", () => {
+	it("rejects native static-layout when speed edits are outside the editor speed range", () => {
 		const speedRegions: SpeedRegion[] = [
-			{ id: "speed-1", startMs: 1_000, endMs: 4_000, speed: 3 },
+			{ id: "speed-1", startMs: 1_000, endMs: 4_000, speed: 31 },
 		];
 		const exporter = createExporter({ speedRegions });
 
@@ -469,10 +533,10 @@ describe("ModernVideoExporter native static-layout eligibility", () => {
 				videoInfo,
 				58,
 			),
-		).toBe("native-speed-timeline-validation-pending");
+		).toBe("unsupported-native-speed-timeline");
 	});
 
-	it("keeps speed-only projects on the renderer path even when audio and video share filtergraph segments", () => {
+	it("allows speed-only projects when audio and video share filtergraph segments", () => {
 		const speedRegions: SpeedRegion[] = [
 			{ id: "speed-1", startMs: 1_000, endMs: 4_000, speed: 1.5 },
 		];
@@ -494,10 +558,10 @@ describe("ModernVideoExporter native static-layout eligibility", () => {
 				videoInfo,
 				59,
 			),
-		).toBe("native-speed-timeline-validation-pending");
+		).toBeNull();
 	});
 
-	it("keeps slow-speed timelines on the renderer path until native duplication is revalidated", () => {
+	it("allows slow-speed timelines through native frame duplication", () => {
 		const speedRegions: SpeedRegion[] = [
 			{ id: "speed-1", startMs: 1_000, endMs: 4_000, speed: 0.5 },
 		];
@@ -519,10 +583,10 @@ describe("ModernVideoExporter native static-layout eligibility", () => {
 				videoInfo,
 				63,
 			),
-		).toBe("native-speed-timeline-validation-pending");
+		).toBeNull();
 	});
 
-	it("keeps slow-speed webcam timelines on the renderer path while native source-time mapping is pending", () => {
+	it("allows slow-speed webcam timelines through native source-time mapping", () => {
 		const speedRegions: SpeedRegion[] = [
 			{ id: "speed-1", startMs: 1_000, endMs: 4_000, speed: 0.5 },
 		];
@@ -543,10 +607,10 @@ describe("ModernVideoExporter native static-layout eligibility", () => {
 				videoInfo,
 				63,
 			),
-		).toBe("native-speed-timeline-validation-pending");
+		).toBeNull();
 	});
 
-	it("skips native speed timelines even with a resolvable webcam source", () => {
+	it("allows native speed timelines with a resolvable webcam source", () => {
 		const speedRegions: SpeedRegion[] = [
 			{ id: "speed-1", startMs: 1_000, endMs: 4_000, speed: 1.5 },
 		];
@@ -574,6 +638,6 @@ describe("ModernVideoExporter native static-layout eligibility", () => {
 				videoInfo,
 				59,
 			),
-		).toBe("native-speed-timeline-validation-pending");
+		).toBeNull();
 	});
 });
diff --git a/src/lib/exporter/modernVideoExporter.ts b/src/lib/exporter/modernVideoExporter.ts
index 6d8f92c9..fae0d21b 100644
--- a/src/lib/exporter/modernVideoExporter.ts
+++ b/src/lib/exporter/modernVideoExporter.ts
@@ -165,6 +165,8 @@ type NativeAudioPlan =
 	  };
 
 const FILTERGRAPH_FALLBACK_AUDIO_SAMPLE_RATE = 48_000;
+const MIN_NATIVE_STATIC_LAYOUT_SPEED = 0.25;
+const MAX_NATIVE_STATIC_LAYOUT_SPEED = 30;
 
 type NativeStaticLayoutTimelineSegment = {
 	sourceStartMs: number;
@@ -174,6 +176,14 @@ type NativeStaticLayoutTimelineSegment = {
 	speed: number;
 };
 
+function canUseNativeStaticLayoutSpeed(speed: number): boolean {
+	return (
+		Number.isFinite(speed) &&
+		speed >= MIN_NATIVE_STATIC_LAYOUT_SPEED &&
+		speed <= MAX_NATIVE_STATIC_LAYOUT_SPEED
+	);
+}
+
 function buildNativeStaticLayoutTimelineSegments(
 	segments: Array<{ startMs: number; endMs: number; speed: number }>,
 ): NativeStaticLayoutTimelineSegment[] {
@@ -1008,11 +1018,63 @@ export class ModernVideoExporter {
 	}
 
 	private buildNativeStaticLayoutSourceSegments(sourceDurationMs: number) {
-		return buildEditedTrackSourceSegments(
-			sourceDurationMs,
-			this.config.trimRegions ?? [],
-			this.config.speedRegions ?? [],
-		);
+		if (!Number.isFinite(sourceDurationMs) || sourceDurationMs <= 0) {
+			return [];
+		}
+
+		const speedRegions = this.config.speedRegions ?? [];
+		if (
+			speedRegions.some(
+				(region) =>
+					!Number.isFinite(region.startMs) ||
+					!Number.isFinite(region.endMs) ||
+					!canUseNativeStaticLayoutSpeed(region.speed),
+			)
+		) {
+			return [];
+		}
+
+		const normalizedSpeedRegions = speedRegions
+			.map((region) => ({
+				startMs: Math.max(0, Math.min(region.startMs, sourceDurationMs)),
+				endMs: Math.max(0, Math.min(region.endMs, sourceDurationMs)),
+				speed: region.speed,
+			}))
+			.filter((region) => region.endMs - region.startMs > 0.5);
+		const sourceSegments: Array<{ startMs: number; endMs: number; speed: number }> = [];
+
+		for (const keptRange of this.buildNativeTrimSegments(sourceDurationMs)) {
+			const boundaries = new Set<number>([keptRange.startMs, keptRange.endMs]);
+			for (const speedRegion of normalizedSpeedRegions) {
+				const startMs = Math.max(keptRange.startMs, speedRegion.startMs);
+				const endMs = Math.min(keptRange.endMs, speedRegion.endMs);
+				if (endMs - startMs > 0.5) {
+					boundaries.add(startMs);
+					boundaries.add(endMs);
+				}
+			}
+
+			const orderedBoundaries = [...boundaries].sort((left, right) => left - right);
+			for (let index = 0; index < orderedBoundaries.length - 1; index += 1) {
+				const startMs = orderedBoundaries[index] ?? 0;
+				const endMs = orderedBoundaries[index + 1] ?? 0;
+				if (endMs - startMs <= 0.5) {
+					continue;
+				}
+
+				const midpointMs = startMs + (endMs - startMs) / 2;
+				const speedRegion = normalizedSpeedRegions.find(
+					(region) => midpointMs >= region.startMs && midpointMs < region.endMs,
+				);
+				sourceSegments.push({
+					startMs,
+					endMs,
+					speed: speedRegion?.speed ?? 1,
+				});
+			}
+		}
+
+		return sourceSegments;
 	}
 
 	private buildNativeStaticLayoutVideoTimelineSegments(
@@ -1244,9 +1306,6 @@ export class ModernVideoExporter {
 		if (isVideoWallpaperSource(configuredWallpaper)) {
 			reasons.push("unsupported-background-video");
 		}
-		if (speedRegions.length > 0) {
-			reasons.push("native-speed-timeline-validation-pending");
-		}
 
 		const hasZoomRegions = (this.config.zoomRegions ?? []).length > 0;
 		const needsTimelineMap = this.shouldUseNativeStaticLayoutTimelineMap(
@@ -1257,11 +1316,14 @@ export class ModernVideoExporter {
 			reasons.push("native-timeline-requires-windows-gpu");
 		}
 		if (
-			speedRegions.length === 0 &&
 			needsTimelineMap &&
 			this.buildNativeStaticLayoutVideoTimelineSegments(videoInfo).length === 0
 		) {
-			reasons.push("unsupported-native-trim-timeline");
+			reasons.push(
+				speedRegions.length > 0
+					? "unsupported-native-speed-timeline"
+					: "unsupported-native-trim-timeline",
+			);
 		}
 		if (hasZoomRegions && this.config.experimentalNativeExport !== true) {
 			reasons.push("native-zoom-requires-windows-gpu");