Sounds like maybe some power saving feature kicks in? Did you already try to set windows to "best performance" (or whatever it is called) in the energy settings?

Quote from Dygear :

Here's an InSim packet that I'd like to see. IS_TRE (Tire)
...

Or for more compact, it could be bitwise

@troy no power saving feature kicks in i guarantee you that. its the game.

Quote from DarkKostas :

Or for more compact, it could be bitwise

Ah, I'm an idiot. I did not define them correctly, they were meant to be bitwise from the start. As you see in the comments, 1, 2, 4, 8, ect.

Quote from Dygear :

Here's an InSim packet that I'd like to see. IS_TRE (Tire)

Whats the difference with IS_HLV?

Quote from ShUckErU :

Regarding frame rates, i run a laptop with nvidia 670mx [..]

HOWEVER. after prolonged running of LFS, i.e. above 5 hours give or take, framerate drops to 45fps. [..]

I have a 675mx, no problems at all. Not with 1 hour, 5 or 24 hours.

Isn't it heat? 670mx uses the old Fermi core, not very good with heat control. Nvidea inspector can tell more. Core clock rate, GPU load. If it gets too hot it underclocks itself until it cools down.

It's better to limit framerate to 100 FPS anyway. Overhead is not needed, uses unnecessary power and generates more heat then required. Internal LFS physics also work @100 Hz so its perfectly in sync.

Thank you all for your testing.

There is now a new test patch 0.6F3 with DK2 support.

https://www.lfsforum.net/showthread.php?t=86202