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Developer mode really does help, but it's more about removing visual delays that make the system feel sluggish than about actually speeding things up. Disabling transition animations is a classic trick, and people are right about it. But there are a couple more settings that actually affect responsiveness. For example, you can reduce animation scale from 1x to 0.5x or disable it completely - this applies not just to app transitions, but also to opening menus, notifications, and windows. There's also an option for limiting background processes - it genuinely saves resources if you configure it properly.
My hack: enable GPU rendering logging (there's an option for that in developer settings) and see which operations are making the system lag. If you notice that rendering some part of the interface is slow, try disabling live wallpapers or lowering the screen refresh rate. Not everyone does this, but the effect can be noticeable sometimes. And most importantly - after experimenting in developer mode, check your battery, because some of these settings drain it way more than the visual improvement is worth.
I've got Developer Mode turned on my phone, but not for speeding things up - I disabled the animation for screen transitions there, and the interface actually does feel more responsive.
But that's not magic, it's just removing unnecessary glitches. If your phone is lagging, the problem is usually a cluttered storage or some app running in the background eating up resources, not something you need to mess with in Developer Mode. I've seen people randomly tweak stuff in there - like limiting background processes or turning off sync - and then complain that something broke or stopped working.
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