Performance: multiple select triggers reflows

[naltatis]

I noticed that the multiple-select significantly slows down performance because it forces the browser to recalculate the layout. On a page with many select elements the impact is huge and blocks the browser for quite a while.

I've compiled a plunker showing this effect:
http://plnkr.co/edit/DpBir51UqvBjR8hZzfsf?p=preview

The calculation is triggered from the uiSelectMatch link function:

if($select.multiple){
    $select.sizeSearchInput();
}

When I comment out these lines the sample code gets rendered 3x faster.

It does not seem to effect functionality. The size of the input does not change. Am I missing something here?

naltatis

[wesleycho]

The sizeSearchInput method could use a heavy dose of optimization - the code is extremely fishy.