java affinity setting for performance

We are running LSF 9.0.1 on Win 2008 R2 VM server with 8 processors and are working on some performance tuning.  We’ve been monitoring the usage on the server and have noticed that CPU usage is usually around 15-20%.  To see if we could improve performance and use less resources, we dropped the server down to 4 processors.  We are not sure if users see any significant increase/decrease in wait times (one usually only hears about the increase waits), but from a monitoring perspective we see that we now have 8 java processes running across 4 cpu’s instead of 8.  We have seen a couple of minor “bottlenecks” in the morning, but that is the only issue we have noticed since dropping down.  Our network group was wondering if anyone sets the CPU affinity for the java.exe process to help with performance.  Also, how many processors are others using on their LSF application server.