Using Multiple Selectors to search by tag name is significantly slower since 1.4.3

[[email protected]…]

Starting in jQuery 1.4.3, finding elements using multiple selectors and tag names is dramatically slower (10-30x slower). For example .('input,select') now takes much longer.

See performance tests at: ​http://jsperf.com/jquery-selector-performance-problems

[Rick Waldron]

I'm getting different results with a perf test that we've used on other recent dom traversal/manipulation...

​http://jsperf.com/multiple-tag-selector

[[email protected]…]

Interesting, it seems to perform fine in your test when searching for divs/spans, but it's still slow searching for inputs/selects.

In this version, I took your test, increased the count from 500 to 1000 (to help emphasis the slowness), and repeated all of your tests but searched from 'input,select' instead of 'div,span'.

​http://jsperf.com/multiple-tag-selector/2

[Rick Waldron]

In 1.4.3, Sizzle began branching as much selector work to querySelectorAll, which results in less work and overall higher performance.