Benchmark: Math.round vs 0.5 << 0

Script Preparation code:

window.round = (val, decimalScale = 1) => Math.round(val * decimalScale) / decimalScale;
window.bitRound = (val, base = 1) => (val * base + 0.5 << 0) / base;

Tests:

round
round(Math.random(), 100);
bitRound
bitRound(Math.random(), 100);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
round
bitRound

Fastest: N/A

Slowest: N/A

ⓘ Get performance results from real users on your website with Request Metrics.

Website Performance Monitoring by Request Metrics

Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.5 Safari/605.1.15

Browser/OS: Safari 16 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
round	2896543.0 Ops/sec
bitRound	4171891.0 Ops/sec

Math.round vs 0.5 << 0 (version: 0)

Comparing performance of: round vs bitRound

Created: 10 months ago by: Registered User

Jump to the latest result

round

bitRound

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A