Fallout 4 FPS Issues

[Knaj]

So, this is kind of complicated, but let me explain this. 

 

Fallout 4 runs completely fine, but only when in use. 

If I leave fallout 4 running while doing nothing in the game, or even just on the home screen, the fps of my WHOLE COMPUTER will slowly start to go down.

The longer I leave it, the worse it gets.

Usually around the 5 minute mark after doing nothing performance starts to go down. Even after I close fallout 4 my PC is just too laggy to be able to use, and the only way to fix it is a complete restart of the whole computer.

This issue has fixed itself before twice, but on numerous occasions it doesn't.

For example, if I leave my PC on with fallout 4 running to go have dinner, and come back, the game might be running at 13 fps, where it usually runs at a constant 60.

I thought it might be a memory leak, but if it was, then the performance would go down as I'm playing the game too, which it doesn't do.

 

It really confuses me, and sorry for the bad explanation. If you have any questions, ask below.

Thank you!

[HPWebcamAble]

It can still be a memory leak, which is only triggered when the game idles.

 

Open MSI Afterburner and keep an eye on the graphs. Leave it for a bit. What does it look like?

Can you upload some screenshots of the graphs?

[Knaj]

1 minute ago, HPWebcamAble said:

It can still be a memory leak, which is only triggered when the game idles.

 

Open MSI Afterburner and keep an eye on the graphs. Leave it for a bit. What does it look like?

Can you upload some screenshots of the graphs?

Alright. I'll play it for a bit and then leave it to idle.