Re: Why is querySelector much slower?

On 4/28/15 2:13 AM, Glen Huang wrote:
> On second thought, if the list returned by getElementsByClass() is lazy
> populated as Boris says, it shouldn't be a problem. The list is only
> updated when you access that list again.

Mutations have to check whether the list is marked dirty already or not.

This is not too bad if you only have a few lists around, but if you have 
several thousand it can start to hurt.

-Boris

Received on Tuesday, 28 April 2015 14:59:40 UTC