`JSON.stringify` is ~2.4× faster than `JSON.parse`

For the same megabyte, parsing costs more than serialising. Parsing has to tokenise and build objects.

Result

Run	`JSON.parse` (1 MB)	`JSON.stringify` (same object)	Ratio
Run 1	3.284	1.167	2.81×
Run 2	2.850	1.186	2.40×
Run 3	2.868	1.212	2.37×

Median spread: `JSON.parse` (1 MB) CV 6.7% / `JSON.stringify` (same object) CV 1.5% / Ratio CV 8.0% (computed from the 3 runs)

Conditions

Parsing a 1 MB JSON string versus stringifying an object of the same size.

Where this number does not apply

The ratio moves with shape — deep nesting, numeric density, string length. We measured one structure only.

Reproduce

cd bench
node --expose-gc micro-fixed.mjs --out ../data/run.json --samples 21

Run it three times on the same machine; if the spread of median stays under 10%, you should land on the same conclusion. If your numbers disagree, tell us and we will retract.