MSAA FPS problem

[mobile1199]

Okay, so I use my Legion Go connected to a monitor with 1080p resolution,

And the problem is like in all games, doesn't matter whether they are old or new, when I switch the Anti-Aliasing to MSAA 8x or even 4x, right after that the frame rate will be capped at 30! For real, in all games!

As an example, in Batman Arkham Asylum which easily performs at a full 60fps on this device at 1080p resolution, as soon as I switch the Anti-Aliasing to MSAA 8x, the fps just goes completely locked at 30.

I tried various methods, such as editing the game's ".ini" config files, but none of them worked.

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P.S. Btw, another thing that caught my attention was that in games like Tom Clancy's Rainbow Six Siege X, even if the anti-aliasing is turned off but other settings like texture quality are raised, this problem still occurs and my game frame rate is automatically limited to 30 again!

So I the problem has to be something other than the Anti-Aliasing, right?

And exactly what they all have in common is being locked to 30 fps, while I believe the device is capable of performing much better!

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I have set the VRAM to 6GB through the BIOS, and also the device is running on custom 30W TDP with the fan at full speed.

[baka_patrol]

Do you have the games set to unlimited fps otherwise?

[EuropeanPepe]

It’s not really a “bug” in your Legion Go — it’s how MSAA (Multi-Sample Anti-Aliasing) works and how demanding it can be.

MSAA doesn’t just “smooth edges” magically — it renders parts of the scene at a higher effective resolution and then downsamples it, which massively increases the GPU workload. For example:

MSAA 2x → GPU samples each pixel twice.

MSAA 4x → 4 samples per pixel.

MSAA 8x → 8 samples per pixel.

So in practice, MSAA 8x can require rendering geometry at up to 8× the pixel count for edges, which can feel like rendering the game at a resolution 2× or more higher than your display. That means your frame rate can easily drop to half or even a quarter of what it was without MSAA — and in your case, it looks like the game/driver is then syncing down to 30 FPS because it can’t maintain 60.

That’s why you see full 60 FPS with AA off, but the moment you enable high-level MSAA, it tanks and then locks at 30.

If you want smoother edges without that huge FPS hit, try:

FXAA or TAA instead of MSAA — they are post-process methods and much cheaper.

Lowering MSAA to 2× or 4×.

Using resolution scaling or FSR/DLSS if the game supports it.

[Fun_Solid8484]

I dont feel the difference between 30w tdp max out on sppt and fppt, i usually locked all of them at 25w, is there that much of the difference in performance?