You can disable it in the acp, it's called necro threshold. Set to 0 to disable.
Assuming you're talking about my blog post from this morning?
@julian yep, talking about that one. I've actually done some testing with a web app I developed on the performance between jQuery and vanilla JS. It's only sometimes that vanilla is really faster. (I did manage to get one jQuery routine from about 300ms to ~14ms with vanilla JS though!)