Run results for: getComputedStyle - call + access variations.

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:132.0) Gecko/20100101 Firefox/132.0

Browser: Firefox 132

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

Stash compute

9.2M/s

Mostly compute

4.4M/s

Always compute

4.4M/s

View exact numbers

Test name	Executions per second
✓ Stash compute	9,229,050 Ops/sec
Mostly compute	4,437,836 Ops/sec
Always compute	4,353,610 Ops/sec

HTML Preparation code:

<style type="text/css"> .ok { gap: 20px } </style>
<div class="ok"><div>one</div><div>two</div></div>

Script Preparation code:

var okThen = document.querySelector('.ok');

var alwaysGet = (function () {
   return function () {
     return window.getComputedStyle(okThen, null).columnGap || window.getComputedStyle(okThen, null).gap;
   }
})();

var mostlyGet = (function () {
   return function () {
     var got = window.getComputedStyle(okThen, null);
     return got.columnGap || got.gap;
   }
})();

var stashGet = (function () {
   var got;
   return function () {
     got = got || window.getComputedStyle(okThen, null);
     return got.columnGap || got.gap;
   }
})();

Tests:

Always compute
alwaysGet();
Mostly compute
mostlyGet();
Stash compute
stashGet();