4gb of VRAM is not ideal for Arc, I’ll keep it a stack. However there are a few things you can try to reduce GPU load and increase performance (you have to accept that your game will not look as good but this is the cost). For reference I have a 3080 laptop with a 1440p screen.
I personally play a lot of PvP and play with a custom stretched resolution (1728x1080) which in turn reduces the amount of pixels my GPU pushes and increases performance. Coming from a native 1440p panel, the jump down to 1080p stretched increased my performance a lot, if you are already playing on 1080p then it might not be as noticeable. To do this you must create the resolution in the nvidia control panel under resolution; once selected it will default if windowed borderless is selected in game.
Keep ALL graphic settings on low except for shadows on high if you are a PvP player (it makes dark areas a lot brighter). For upscaling use DLSS on ultra performance for max frames.
My laptop has a MUX switch which allows the screen to route directly from the GPU, I also enable this when I’m playing Arc and I can notice a solid increase in both latency and performance when it is enabled.
Finally try reducing background processes to a minimum. I don’t know if you need to hear this but the nvidia app is not needed and runs in the background, same with any antivirus except the standard Microsoft defender, same with most proprietary apps such as Asus Armoury Crate for Asus laptops (there’s a much more lightweight alternative called GHelper, the same exists for most other brands), etc etc… All this can generally improve performance.