These links explains the tips to tune the disk io by setting read-aheads and memory based improvements by making changes to kernel parameters like vm.swapiness, vm.overcommit_memory, vm.dirty_background_ratio, vm.dirty_ratio. They also suggests some vmware config tweaks like mainMem.useNamedFile. Worth trying if you have Vmware performance issues. But dont try in production unless you are sure of what you are doing.
These posts explain about Vmware performance tuning on Linux servers.