VM slowed down

[JAN_2500]

Hey, for whatever reasons my VM is suddenly after a month of successful deployment slowed down.

Symptoms:

- Mouse clicks delayed

- Whole VM unresponsive for some time, then responsive again

- Everything feels sluggish, slow not like it was before

I tried one of the KB articles:

https://kb.vmware.com/s/article/1027805

But not difference - I also re-installed VM Tools, also no improvement.

Any idea what is going on?

Thanks

[scott28tt]

Host OS and version?
Guest OS and version?

Fusion version?

Mac specification?

VM specification?

[JAN_2500]

Hey.

Win 10 Version 1809

Mac 10.15.7

Fusion 12.0

iMac 2020 Edition - i7, 32 GB Ram

Not sure what you mean with VM specification?

[scott28tt]

Not sure what you mean with VM specification?

CPU and memory allocation to the VM.

Do you have anti-virus installed in the guest?

Installed any updates on your host OS or the guest OS?

[JAN_2500]

4 processors and 16 GB RAM to the VM

No updates are installed on both host and guest OS.

Yes, antivirus is standard. Was running from day 1.

[ColoradoMarmot]

Do you  happen to use a Fusion drive?  That can cause slow-downs as the OS moves pieces of the virtual disk from the SSD to the spinning disk.  Changing from a split disk to a single file seems to help solve the problem.

[JAN_2500]

No not at all.... It was all fine for a month and suddenly it started.

[JAN_2500]

Once I set Gaming -> Always optimize mouse for games, the lack is gone.

Any why this suddenly happening? How to fix.