Strange sim speed change on save/reopen

[KenTanker0us]

Thank you for your time, Kresimir. Here are my results:

Could you try to set Scanline as renderer, save scene and reopen and see the result.

Condition did not change after doing this.

Try to delete FumeFX grid, save and reopen - does viewports go black ?

No the viewports did not go black, and the scene opened faster.

If nothing helps, maybe could you please get the latest video card drivers and see if it helps?

I did this as well. It did not help, sorry to say.

I am stumped Kresimir, I hope you aren't !

Again I thank you very much for your help.

Ken