Technology & Computing
WebAssembly vs JavaScript Execution Speedup Calculator
Estimate net execution speedup of WebAssembly over JavaScript for a workload, accounting for compile/instantiation overhead.
Your inputs
Change any value to update the result instantly.
Net speedup (incl. overhead)
2.6087 x
Total JS time
1,000 ms
Total Wasm time
383.3333 ms
Breakeven number of runs
1
Runs modeled
1
Compile/instantiation overhead is paid once, so speedup improves as run count increases.
Formula and working
Net Wasm time = (JS time ÷ speedup factor) + compile overhead; Breakeven when JS time = Net Wasm time
- 1
Collect the inputs
JavaScript execution time (ms) = 1,000 ms; Raw Wasm execution speedup factor = 3 x; Wasm compile/instantiate overhead (ms) = 50 ms; Number of runs (compile amortized once) = 1
- 2
Apply the formula
Net Wasm time = (JS time ÷ speedup factor) + compile overhead; Breakeven when JS time = Net Wasm time
- 3
Result
Net speedup (incl. overhead) = 2.6087 x
Frequently asked questions
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
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