WebGPU & WebGL Stress Test & Benchmark
Push your GPU cores to 100% capacity directly in your browser. Measure sustained average FPS, diagnose 1% low micro-stutters, map thermal throttling decay curves, and detect unmasked graphics hardware.
Shader Ready for Execution
Ramps up a high-precision 3D fractal raymarcher with multi-point lighting, dynamic volumetric smoke, and specular highlights to push your GPU cores to 100% utilization.
FPS Stability & Thermal Decay Timeline
Increases fractal iteration depth and multi-bounce illumination calculations.
Scales internal canvas buffer resolution (2.0x forces heavy 4K/UHD raster fill-rate).
Pushes rasterizer fill rate and memory bandwidth stress across background layers.
Reserved banner container configured with strict Core Web Vitals CLS = 0 layout preservation.
How Browser-Based GPU Stress Testing Works
Traditionally, testing graphics card stability required downloading multi-gigabyte desktop benchmarks (such as 3DMark, FurMark, or Unigine Heaven). Modern web technologies—specifically WebGPU and WebGL 2.0—now grant browsers direct, low-overhead access to your GPU's unified shader cores, compute pipelines, and VRAM memory controllers.
Our benchmark executes a real-time mathematical Raymarching Distance Field. Rather than rasterizing simple static polygons, the fragment shader computes tens of millions of mathematical ray-sphere distance intersections per second, accompanied by multi-bounce specular reflections, dynamic volumetric smoke, and trigonometric particle noise. This forces your graphics card to sustain continuous 100% compute utilization.
Why 1% Low FPS Matters More Than Average FPS
In competitive gaming and real-time graphics, relying solely on average FPS is notoriously misleading. A system might boast a "120 FPS Average" yet feel choppy and unresponsive if frame times fluctuate violently.
Calculated by taking the slowest 1% of all rendered frame times over the test duration. If your average is 100 FPS but your 1% low is 35 FPS, you will experience noticeable hitching and input lag spikes during demanding visual effects.
Captures the single slowest 1 frame out of every 1,000 frames. Drops in 0.1% lows are typically caused by PCIe bus bandwidth bottlenecks, background Windows CPU scheduling interruptions, or thermal throttle clock drops.
Diagnosing Thermal Throttling & Laptop TDP Limits
Modern GPUs from NVIDIA (Boost 4.0), AMD (SmartShift), and Apple (Metal silicon) dynamically ramp core clock frequencies based on thermal headroom and silicon temperature. In the first 10 seconds of a stress test, a GPU operates at maximum boost clocks because the heatsink and heatpipes are cool:
As the copper coldplate absorbs heat and reaches 75°C – 85°C, the GPU driver automatically scales back voltage and clock speeds by 10% to 20% to prevent thermal runaway. This is visible as a gradual downward curve on our real-time FPS stability timeline.
If your frame rate plummets by more than 25% after 30 seconds, your device is suffering from inadequate cooling. On gaming laptops, this commonly indicates dried-out thermal paste, clogged intake dust vents, or sub-optimal fan curves.
Graphics Architecture: WebGPU vs. WebGL 2.0
| Feature | WebGL 2.0 (OpenGL ES 3.0) | WebGPU (Vulkan / Metal / Direct3D 12) |
|---|---|---|
| Underlying OS API | Legacy OpenGL state machine wrapper | Direct mapping to DirectX 12 / Metal / Vulkan |
| Compute Shaders | Unsupported (Requires fragment render hacks) | Native first-class GPGPU compute passes |
| CPU Overhead per Draw Call | High (Global state validation bottlenecks) | Extremely low (Pre-baked pipeline objects) |
| Multithreaded Recording | Single thread only | Supported via Web Workers |
Frequently Asked Questions
No. Modern GPUs have built-in silicon safeguards (thermal cut-offs and hardware voltage regulators) that automatically scale down power long before dangerous thresholds are reached. Browser shaders execute within secure operating system sandboxes.
Web browsers naturally synchronize canvas animations to your screen's refresh rate (V-Sync). If you have a 60Hz display, the maximum frame rate is 60 FPS. To test higher frame rates, run the test on a 144Hz/240Hz monitor or disable browser V-Sync via launch flags.
Go to chrome://settings/system (or edge://settings/system) and ensure that "Use graphics acceleration when available" is toggled ON. Then restart your browser.
The GPU Score combines sustained average FPS, shader complexity multiplier, and resolution scale into a single standardized benchmark metric. Higher scores indicate superior raymarch compute performance.