Mountain Lion has been great so far but I'm experiencing very frequent (coloured balls) and sluggishness with VMware Fusion running on Windows 7 32-bit. I didn't have this problem with Lion. Currently vmware-vmx on Activity Monitor shows 101% CPU usage. I did clean install with Mountain Lion. I have a Macbook Pro 13inch 2.26GHz (mid-2009) model and 4GB RAM. I don't know if I should upgrade my RAM to 8GB or go for a SSD. Which of these will be best as an upgrade for a overall system smoothness ?