Run results for: divide by 2 vs multiply by 0.5 - 1

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser: Chrome 130

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

multiply by 0.5

149/s

div by 2

147/s

div by 2.0

143/s

bitwise

73/s

View exact numbers

Test name	Executions per second
✓ multiply by 0.5	149 Ops/sec
div by 2	147 Ops/sec
div by 2.0	143 Ops/sec
bitwise	73 Ops/sec

Script Preparation code:

const length = 100000;
const tmp_nums=[];
for (let i = 0; i < length; i++) {
  tmp_nums.push(Date.now() + Math.random());
}
nums = [...tmp_nums];
nums_len = length;

Tests:

div by 2
const length = nums_len; for (let i = 0; i < length; i++) { nums[i] /= 2; }
div by 2.0
const length = nums_len; for (let i = 0; i < length; i++) { nums[i] /= 2.0; }
multiply by 0.5
const length = nums_len; for (let i = 0; i < length; i++) { nums[i] *= 0.5; }
bitwise
const length = nums_len; for (let i = 0; i < length; i++) { nums[i] = nums[i] >> 1; }