There are a bunch of selects in the interface that list every single poll or wiki article. With thousands of such articles (including translations and staging) and two polls for each, it's causing HUGE lists of things to be output that must then be parsed and then run through dozens of regexp filters -- not to mention every item is checked for permissions which is dozens of database queries each. This times out constantly. Generally speaking, we don't use the polls/article lists in this way (we've never put polls in the sidebar modules or in dynamic content) and if we did, we could always just use a text input area rather than a dropdown. This will dramatically speed up pages like tiki_admin_modules etc. The same goes for freetags, article translation etc. Sometimes we just don't need a list of all the options and it takes longer to scroll through 10K lines looking for what you want than it would to just type it.
Sounds like a tracker bug.
Blockers fixed and tiki gone.