wine users - Sep 2010 - Powerbuilder Application Slow with any inner dialogs

Hi All
I am using wine for a Powerbuilder 7 Application. Complete functionality works
fine, as of now have not found anything with is not working.
The current concern is with the response time of any dialog popup, its is around
20 secs slower than same app on windows machine. I have seen everytime a window
suppose to popup, the cpu is 100%.
Also I have seen the same application on a dual core works like charm and the
response time is just like on windows machine.
I have seen no increase in the ram in both the machines, only the CPU.
Please do suggest me what can i try to make the response time faster on single
core desktops. Please do let me know any details is required.
Wine I have used 1.2, 1.3 also on lubuntu and puppy linux.

Thank you.
raghu

I have overridden any of the application dlls except for the wine's oledb32,
odbc32, odbccp32. I guess some of this came when I installed MDAC_TYPE. Should I
override the application related dll's (like the pb*.dlls) ? will this
improve the response time ?