Lagging after Tabbing!

If I am playing a game (as far as I know, any game), and I tab out to Windows to do something else, when I return to the game there is a good chance that it will then suffer from severe lag. This is when I move the mouse (view) around that it stutters and lags. The only remedy I have found is to restart the game.
It will even do it when the content of the screen is frozen (I am in a menu) and just moving the mouse pointer around. The problem manifests as a sharp drop in fps.
This is not a recent problem. It has been doing it for at least a year, probably longer.
Does anyone have a clue what this might be or how to fix it?
I have taken a snapshot of the difference between normal running, solid at the start, then the mess it turns in to if I tab out and tab back in.

This guide applies to Windows 11 as well.

This guide will explore the causes and provide solutions to fix and prevent game stuttering, enhancing your gaming experience.

I found a solution.
NVIDIA Latency Boost eliminates the lag.

Pocah said:

I found a solution.
NVIDIA Latency Boost eliminates the lag.

Click to expand...

Glad to know you solve the problem!

Oh, no, sorry, it's back. I thought that I had, but apparently not.

The thing is that it doesn't normally lag at all, its only when I tab out and back in. It's a nuisance to have to restart the game every time.

See disabling Virtualization-Based Security (VBS) feature of Windows 11 will resolve the problem.

FreeBooter said:

See disabling Virtualization-Based Security (VBS) feature of Windows 11 will resolve the problem.

How to disable VBS in Windows 11 to improve gaming

Windows 11's security features can cause a drop in gaming performance. If you want to make sure yours isn't impacted, here's how to turn off VBS in Windows 11.

www.digitaltrends.com

Click to expand...

Alas, it is already off.