I've noticed that when using this build when the call tips are displayed, I get extremely high CPU usage. On average from 8 to 10%, but when the call tips are displayed, if I start to type text, the CPU usage will spike to 100% and remain there while I keep typing text.
What's interesting is that even with Code Completion disabled, just typing in the editor will drive the CPU usage to 65% or so.
edit: Should have mentioned, I'm running Windows XP SP1.