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Volume Shader BM Phone Test: Mobile WebGL Benchmark Guide

Learn how to run Volume Shader BM on phones and tablets. Covers safe presets, thermal throttling, browser settings, battery mode, and mobile WebGL limits.

Published 2026-05-07/Updated 2026-05-09

What you'll learn

  • How to start with a safe mobile preset before increasing workload.
  • Why phones and tablets throttle more quickly than desktop GPUs.
  • Which browser, battery, display, and thermal notes matter most.
  • How to interpret short mobile runs versus sustained mobile runs.
  • When iPhone and Android results can be compared directly and when they cannot.

Quick definition

A Volume Shader BM phone test runs the browser WebGL shader benchmark on iPhone, iPad, or Android hardware. The result is useful for checking mobile GPU support and sustained shader performance, but it must be labeled with browser, battery mode, thermal state, display scale, and run duration.

How should you start a Volume Shader BM phone test?

Phones and tablets can run browser GPU benchmarks, but their thermal envelope is smaller than a desktop graphics card. Start with a light preset or lower complexity level and stop if the browser becomes unresponsive.

A phone result is still useful when the conditions are written down. Browser, OS version, battery mode, case, room temperature, and whether the screen is hot can all change sustained performance.

What question can a mobile WebGL benchmark answer?

A short run answers whether WebGL works and whether the GPU can handle a shader-heavy scene. A longer run answers whether the phone can sustain that work without throttling.

Avoid comparing a cold phone run directly against a warm laptop run. The hardware class, display scale, refresh behavior, and power management are different enough that the comparison needs context.

Which mobile browser settings change the result?

Safari, Chrome for Android, and vendor browsers can expose different GPU backends and timing behavior. If you compare two phones, use the same browser family when possible.

Low-power mode, battery saver, high refresh displays, and background apps can all affect frame cadence. Record those conditions with the result.

Repeatable workflow

01Charge and cool the device

Begin above 50 percent battery, disable low-power mode, and let a hot device cool before measuring.

02Run a light preset first

Use Fog Sphere or Twirl Smoke before Cloud Layer or 3D Fractal to confirm the browser stays responsive.

03Record a short score

Capture FPS and frame time after the first stable 30-60 seconds.

04Check sustained behavior

If you need thermal information, run longer and watch whether FPS drifts down over time.

Comparison notes

QuestionVolume Shader BMOther approach
Best presetFog Sphere or Cloud Layer at a modest complexity level.Native mobile suites often use fixed scenes and platform-specific APIs.
Main riskBrowser lag, heat, and thermal throttling during sustained shader work.Native apps may access deeper hardware telemetry but require installation.
Useful outputFPS trend, frame time, and whether the browser remains stable.Composite score plus platform-specific device ranking.

Key takeaways

  1. 01 Start mobile tests with lighter presets and stop if the device becomes hot or unresponsive.
  2. 02 Mobile results are strongly affected by thermal limits, battery mode, browser backend, and display scale.
  3. 03 A sustained mobile score can drop below the first quick score as clocks settle.
  4. 04 Phone comparisons need more context than desktop comparisons.

FAQ

Is Volume Shader BM safe for phones?

It runs in the browser sandbox, but the GPU workload can be heavy. Use short runs first and stop if the device becomes hot or unresponsive.

Why does my phone score drop during a longer run?

Most phones reduce clocks as heat builds. That drop is thermal throttling, and it is useful information for sustained workloads.

Should I compare iPhone and Android results directly?

You can compare them as browser device results, but note browser, OS, display scale, battery mode, and thermal state with the score.

Related guides

Benchmarking

Volume Shader BM GitHub and cznull Source Guide

Find the original cznull Volume Shader BM demo, the GitHub Pages source, and how this browser GPU benchmark guide relates to the public vsbm code.
Methodology

Thermal Throttling: How Browser GPU Benchmarks Drift

Learn how thermal throttling affects browser GPU benchmarks. Covers heat, boost clocks, power profiles, sustained WebGL workloads, and clear result labels.
Benchmarking

Compare Volume Shader BM Results: FPS and Frame Time Guide

Learn how to compare Volume Shader BM results. Covers FPS, frame time, 1% low, browser settings, power mode, thermal notes, and fair repeatable test runs.
WebGL

WebGL Volume Rendering: How Browser GPU Shaders Work

Learn WebGL volume rendering in the browser. Covers GLSL setup, full-screen passes, uniforms, frame cadence, GPU timing signals, and benchmark limits.
WebGL

WebGL vs WebGPU: Benchmark Differences for Shader Tests

Compare WebGL vs WebGPU benchmarks for shader workloads. Covers browser support, timing, portability, API differences, and Volume Shader BM result scope.

External references

MDN WebGL APIKhronos WebGL Overview3DMark mobile benchmark overview