Tag Archives: MacOS

Solved: slow Windows guest performance in Fusion 8.1 on El Capitan

For a little while, I was bummed by poor peformance of a Windows 8.1 guest running in Fusion 8.1 on El Capitan. Not sure which one of these was the main contributor, but the experience was painful – switching between apps was taking few seconds, which just didn’t seem right considering it’s running on a current MacBook Pro with plenty of RAM, CPU power, and a fast SSD.

Long story short – looks like I’ve found a cure. This solution worked like magic for me:


For those not willing to visit the source – I added the following to the vmx file:

mainMem.backing = "swap"
scsi0:0.virtualSSD = 1
MemTrimRate = "0"
sched.mem.pshare.enable = "FALSE"
MemAllowAutoScaleDown = "FALSE"

Looks like these settings have originated from the following post:

VMware Performance Enhancing Tweaks (Over-the-Counter Solutions)

Happy computing! 🙂