Optimization

[kargaroc]

By the time you've been using this for a while and have a few hundred filters, it takes 10 seconds to make a new filter, and when browsing, by the time all the filters take effect, you're already half-way down the page!
I don't know if things can be optimized, but clearly something isn't scaling up to hundreds/thousands of filters.

edit:
Dunno if this is possible, but one way to mitigate this would be to prevent filtered images from loading at all.
Every thumbnail image contains the substring _by_<username>_d which you can use in an adblocker to stop from loading. If an adblocker can do it, I don't see why this can't.