VMware Workstation 5.5Features | Documentation | Knowledge Base | Discussion Forums
Adequate Free Disk Space
For better performance, avoid the situation of very low free space on the host disk. Performance can degrade considerably when VMware Workstation has to use a nearly-full host hard disk to write guest sparse disk, snapshot, checkpoint, or redo files.
Overcommitting the Host Processors
The performance of virtual machines depends on the capacity of the host machine's processor or processors, and may degrade significantly if you overcommit the processors by running too many virtual machines at the same time.