Variable benchmark results help required

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I am getting mixed results from online and single play with assetto corsa which does not make sense. I can play one game and get over 120 fps then the next race at the same track struggle to get 60fps. If I restart the game and or computer it fixes the problem. I dont have overheating or throttling issues as I keep an eye on those and my computer is just for gaming so very minimal in terms of what is on it.
Intel core I7 2600k
RTX 2060
16gb Ram
And my benchmarks are

AC VERSION: 1.16.3 (x64)
POINTS: 12123
FPS: AVG=82 MIN=27 MAX=132 VARIANCE=14 CPU=92%

LOADING TIME: 30s
GPU: NVIDIA GeForce RTX 2060 (2560x1080)
OS-Version: 6.2.9200 () 0x100-0x1
CPU CORES: 8
FULLSCREEN: ON
AA:4X AF:4X SHDW:512 BLUR:0
WORLD DETAIL: 1 SMOKE:1
PP: QLT:3 HDR:1 FXAA:0 GLR:1 DOF:0 RAYS:0 HEAT:0



AC VERSION: 1.16.3 (x64)
POINTS: 18430
FPS: AVG=125 MIN=57 MAX=152 VARIANCE=7 CPU=89%

LOADING TIME: 24s
GPU: NVIDIA GeForce RTX 2060 (2560x1080)
OS-Version: 6.2.9200 () 0x100-0x1
CPU CORES: 8
FULLSCREEN: ON
AA:4X AF:8X SHDW:512 BLUR:0
WORLD DETAIL: 1 SMOKE:1
PP: QLT:3 HDR:1 FXAA:0 GLR:1 DOF:0 RAYS:0 HEAT:0


As you can see I have upped the quality and got more frame rate?? I play RF2 and do not have this wild swing in terms of frame rate.


Any help would be much appreciated.

 

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Ok an update - I do one race and its fine, I do the exact same race and 2 of the cpus go straight to 100% and my frame rate is low.