I'd start checking on the Performance tabs for the hoist and the guests to see whether you see something unusual.
Regarding the snapshot. With the the provisioned disk space being more than twice the size of the VM, it looks like the VM has active snapshots. You may want to check this in the Snapshot Manager and - if you don't see anything there - check whether the VM's active virtual disk file name (see VM's settings) looks like "vmname-00000x.vmdk".
André