Heavy stuttering with egpu (AMD)

Product: F1 24
Platform:Steam-PC
Please specify your platform model. PC
Summarize your bug Almost unable to drive by stuttering in some certain circuits like Monaco.
What is your 16 digit Report Code?
What peripherals are you using? Please list the exact make and model. CPU : AMD 7840u CPU RAM : 32G GPU : AMD 780m EGPU : AMD 7600m XT (ONEXGPU) AMD adrenaline option : No function enabled.
Can you please provide the name of your current internet service provider?
Which area is the bug/glitch in? Single Player
Steps: How can we find the bug ourselves? Just play with any of egpu.
What happens when the bug occurs? Unable to drive correctly.
What do you expect to see? Figure out the way in graphic settings or else.

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I have problem with my egpu with 7600M XT connected via USB4.

Currently I'm using UMPC of AMD 7840u CPU and 780M GPU and it's all running well without any lagging or stuttering as well. 

But when I switch to egpu with external FHD monitor, it starts lagging and it's almost unable to run in some certain circuit, the worst is Monaco.

Average FPS shows around 53 but minimum is 32 in Monaco and it looks even worse stuttering, but other some simple back ground circuits were good to go.

All graphics setting from low to high runs with same stuttering in above certain circuits.

I have tried several version of gpu drivers, re-install game and windows but nothing could help.

also disabled several options in graphics but not at all. 

Only F1@24 runs bad but other games such as diablo4, RDR2 are running great as expected. 

Please advise what else I can do to fix this up.

I don't want to run many circuits with full assist option. 😢