WebAssembly Performance Tester

Comprehensive WebAssembly performance testing tool for developers. Upload or paste your WASM modules to run detailed benchmarks comparing execution speed with equivalent JavaScript code. Measure memory consumption, startup time, and execution performance across different browsers. Features include automated test suites, visual performance graphs, and optimization recommendations for your WebAssembly applications.

WASM vs JS Benchmarks Memory Analysis Browser Testing Optimization Tips

Quick Examples

SPEED: 2-10x faster than JS
MEMORY: Memory usage graphs
STARTUP: Initialization time

WebAssembly Module

Upload WASM File

Maximum file size: 50MB

Generated JavaScript Code

Benchmark Settings

Test Type

Iterations

Number of times to run each test

Warmup Runs

Runs before measurement to optimize JIT

Compare with JavaScript

Browser Capabilities

WebAssembly Support Checking...

Performance API Checking...

BigInt Support Checking...

Memory API Checking...

Benchmark Results

Select an example or upload a WASM module, then run benchmarks to see results

Performance Visualization

Detailed Statistics

Run a benchmark to see detailed statistics

Export Results

Help & Related Tools

Everything you need to know

FAQ Frequently Asked Questions

What performance metrics can this tool measure?

The tester measures execution time, memory usage, startup/instantiation time, function call overhead, and throughput. It provides comparative analysis between WASM and JavaScript implementations, showing performance ratios and identifying bottlenecks in your WebAssembly modules.

How do I benchmark my WebAssembly module?

Upload your .wasm file or paste WAT (WebAssembly Text) code. Select benchmark tests like mathematical operations, array processing, or custom functions. The tool runs multiple iterations and provides statistical analysis with visual charts comparing WASM vs JavaScript performance.

Which browsers and WASM features are supported?

The tool works in all modern browsers supporting WebAssembly including Chrome, Firefox, Safari, and Edge. It detects browser capabilities and tests features like SIMD, threads, and bulk memory operations when available, providing compatibility reports for each feature.

What file size limitations exist for WASM modules?

The tool can handle WASM modules up to 50MB for optimal performance. Larger modules may experience slower loading times. For accurate benchmarking, we recommend testing focused modules rather than entire applications to isolate performance characteristics.

Can I compare different WASM optimization levels?

Yes! You can upload multiple versions of your WASM module compiled with different optimization flags (-O0, -O1, -O2, -O3, -Os, -Oz) and run side-by-side comparisons. The tool helps identify the optimal compilation settings for your specific use case.