It varies from computer to computer. I could definitely see an older/weaker computer struggling with rendering the output from 10k rows, even with the truncatio

It varies from computer to computer. I could definitely see an older/weaker computer struggling with rendering the output from 10k rows, even with the truncation I implemented, but I wanted it to render enough rows that it could actually measure how long it took with some accuracy by default. The Spectre attack mitigations mean that browsers only provide 2ms to 3ms resolution on their JavaScript/WASM timers now, which makes the measurement accuracy very rough in WASM unless the operation being measured takes a few tens of milliseconds.