MACHANGOUT  If there is anyway you could send us the Crash log for this. it would be amazing and actually tell us which plugin caused the CPU usage.  
(Version 1.0b5)

MACHANGOUT  Do you see anything in the console log? I really would like to reproduce the problem. Anyway you can contact us directly from the site so we can talk more about it.  
(Version 1.0b5)

MACHANGOUT  Unbelievable. Glims is installed on thousands of computers and we never had any problems with CPU.

We also tested with all the different plugins with no such effect. Could you please tell us what you did prior to this happening so we can reproduce the problem and fix it ASAP.  
(Version 1.0b5)

MACHANGOUT  Could you please send us the exact version of Safari you are using so we can reproduce/fix the problem ASAP before our next build.  
(Version 1.0b4)

MACHANGOUT  This is exactly the kind of feedback we are looking for. I am adding it to the request list.  
(Version 1.0b3)