Every mobile gaming guide tells you to open developer options and change four settings. One of them helps a little, one is actively harmful, and the rest do nothing for frame rate. Here is each claim, honestly.

Animation scale: helps, but not the way people say

Setting window, transition and animator scales to 0.5x or off makes your phone feel faster, because menus and app switches stop waiting on animation. That is a real and pleasant improvement.

It does not raise your frame rate in a game. Once you are inside a match, the system animations are not running, so there is nothing to speed up. Turn it off because you like a snappier phone, not because it will help you win a fight.

Force GPU rendering: no, and it can hurt

This forces 2D drawing operations through the GPU for apps that would otherwise use the CPU. Games already render on the GPU, so there is nothing for it to change. What it does do is raise GPU load and therefore heat across the whole system, which on a phone that is already thermally limited means throttling arrives sooner.

Background process limit: usually harmful

Capping background processes sounds like a permanent version of closing apps, but Android's own memory manager is considerably better at this than a fixed limit. Set it too aggressively and apps you actually use get killed and relaunched constantly, which costs CPU, battery and time.

Closing apps before a session is useful. Permanently forbidding the system from keeping any is not the same thing.

Setting	Effect on in-game frame rate	Verdict
Animation scale 0.5x or off	None	Nice for UI speed, not for games
Force GPU rendering	None, adds heat	Leave off
Background process limit	Usually negative	Leave at standard
Force 4x MSAA	Strongly negative	Leave off, it adds GPU work
Disable HW overlays	Negative	Leave off, increases GPU compositing

Force 4x MSAA appears in a surprising number of "boost your FPS" lists. It is anti-aliasing: it makes the GPU do more work per frame, so it lowers frame rate by design. It improves image quality, which is the opposite of what those lists claim.

What about gaming mode?

The gaming or performance mode built into your phone by its manufacturer is a different matter and generally worth using. Unlike a third-party app it can actually influence CPU and GPU governors, hold clock speeds higher, and suppress notifications. It also produces more heat, so on a phone that throttles early the net result can be neutral.

The honest summary

Developer options are for developers. The one change worth making is animation scale, and it improves how your phone feels rather than how your game runs. If you want frames, the levers that actually move are in-game graphics settings, heat management, and free memory on phones with 4 GB or less.