Years ago, we had a similar situation.
As the day progressed and users started to log in, DBA/EVO started to really, really slow down.
It took up to 10 seconds or more to open, search, etc, etc any window, BK or EVO.
The only way to "speed up" DBA/EVO was to reboot the server.
It turned out to be the L1 and L2 cache Pervasive Settings.
It could help you... It is worth a try.
Check my post:
http://cs.pervasive.com/forums/p/15005/52501.aspx#52501 And if you need the best advice in town contact BetrieveBill !!!!
http://www.goldstarsoftware.com/ have fun
Kelloggs