Post 1.6.9 patch...
Monkeying around I have noticed these behaviors, all has to do with group deeded objects.
First, this might have always been true, I really don't know and can't recall, but llOwnerSay() does not work if the object is deeded to a group. That threw me for a while "stupid object won't fire off it's debug spew!". I changed it all to llWhisper() and noticed it was working.
Second, deeding causes listen events to take from 2-4 seconds from the time you say something until the time the script responds.
Third, deeding causes button dialogs (llDialog()) to take 2-5+ seconds to pop up.
I'm guessing *all* script functions perform at a terrible rate as well. I'll continue tinkering around a bit.
(recompiling/taking/rez'n doesn't affect the poor performance, it remains poor)
Deed to Group == Borked scripts, imho.
Edits while I test.. and stay awake
Loops seem unaffected (they're still fast).
Timers (llSetTimerEvent()) seens unaffected.
Blah more oddness, object I'm toying with now appears to be working fine, yet my original object is still hosed. I give up and shall retire to bed!