wine users - Jun 2011 - question on Wine using multiple CPUs

An app I run has a feature to allow the user to choose how many CPU's to use
to run an optimisation procedure.  My system has 8 cores.  It can dual boot to
Windows 7 and Ubuntu 10.10 64bits.  Running the app under Windows 7 and choosing
8 CPU's for optimisation, the speed is greatly improved over using just 1
CPU.  But when I use Wine (1.3.23) on Ubuntu and choose 8 CPU's, it seems
even much slower than using 1 CPU.  There seems to be some bottleneck (possibly
due to locks for synchronisation) somewhere.  This is evidenced by how the
optimisation step number is reported.  Instead of seeing a nearly continuous
step number running through (like when using 1 CPU), I noticed with multiple
CPU's, the step number jumps by the number of CPU's each time it changes
after a pause in between.

How is the status of Wine handling multiple CPU's at the moment?  Is the
phenomenon I see a known issue of Wine in general?  Or is it a specific issue of
my app running with Wine?

The 'wineserver' process is Wine kernel. It is a single threaded
process. Depending on what your application is doing, wineserver could
potentially be the bottleneck. Usually it is not a bottleneck though. Perhaps
you see something interesting in top.