Maybe reset your cache also? That may help some... I will try and maybe contact the local devs.
It's like in the morning it is pretty speedy, but in the afternoon it just slugs. Cache clear or not.
Check Wikia's twitter; they are usually pretty good about posting when there are site problems. It may be more sluggish as the day goes on because of more users on the site (depending on what time zone you live in).
What do you think?