Connect to a PC and use the command: adb shell powercfg set_nps_mode 1 (commands vary by manufacturer).
Always download optimization tools from reputable sources like the or XDA Developers . Avoid "Modded" or "Pro" APKs from unknown websites, as these often contain adware that will actually slow your phone down further. To help you find the right solution, could you tell me: What is your specific phone model ? Are you trying to fix lag in a specific game ? Do you have access to a computer to run a few commands?
If an APK alone doesn't work, you can use ADB (Android Debug Bridge) via a PC to unlock performance. Enable and USB Debugging .