This issue has the CAD users and the IT folks baffled, maybe someone here has seen this issue and can shed some light.

I will be working in an assembly, doesn't matter if it is a small assembly or large, and have multiple items open.  (ie main assy, subassy, and parts)  I can be working fine like this for a while, but then all of a sudden when I open a part up from an assembly into a new window I get hit with major lag.  Try to rotate the part, and two to three seconds later it rotates.   Same thing with activating menus.  I can use ctrl-tab to switch back to any other assemblies or parts I had open, and it works just fine.  ctrl-tab back to the part I just opened, and it's laggy again.  I can close this part, be back in my assembly, and click on the part in the assy and reopen it into a new window again, and I'm hit with the same lag.  Or, if I try to open any other part from this point forward I will get the lag.  Strangely, if this particular part or subassy is open within another assembly, I can switch to that assembly and it has no lag.  It is almost like a new "window", and any new "windows" from that point forward will have the freezing issue.

Physical memory is not an issue, and the video card drivers are the latest certified version.  Machine is a HP xw8400, 64-bit windows XP, Quadro FX4500, 4 gigs of memory.  SolidWorks 2009 SP 4.1.  Have monitored the memory and cpu usage before and during this freeze up issue, and there is nothing to note there, it appears just fine.  So, there is something else going on we have yet to determine.  I have also tried adjusting the video card settings to be pure performance based, and there is no effect there at all... well, except things get pixlated and look like crap, so now the freeze up is just crappier looking.

If anyone has any ideas, I would appreciate it.  I did have our local vendor tech support try to figure it out months ago, with no luck.  At that time we were running 32 bit on the 64 bit machines because of the previous 64 bit issues, and we wrote it off as that being a possible issue with the freezing up.  Well, we are back to 64 bit OS now, and the issue still plagues me on a dailey basis.  Unfortunately, due to crappy economics, we no longer are carrying maintenance and now the only form of tech support available is through these forums.