ASUS ROG Zephyrus G14 GA403 is running very slowly

The checks in more detail

Next look at the heat. Fans and vents clogged with dust, a laptop on a bed or lap, or a hot room cause thermal throttling; use it on a hard flat surface with clear vents and clean the intakes with compressed air at a distance. Monitor the temperature in the Armoury Crate monitor during a heavy task and note whether the clock speed falls as it rises. Software causes follow. Open Task Manager and sort by CPU, memory and disk to find an app that is using resources, and check startup apps in the Startup tab to disable those you do not need.

Windows Update, antivirus scans and OneDrive syncing can run for hours after a big update and slow the machine. Check that storage is not nearly full, since a drive under about ten percent free slows down. Keep Windows, the BIOS, Armoury Crate and the NVIDIA and AMD drivers up to date through MyASUS and Windows Update, as ASUS releases performance fixes. In games, make sure the game uses the discrete GPU, set in Windows graphics settings. If the slowdown follows an update, roll back the driver. Run a malware scan and a memory check if the machine also freezes.

If performance stays poor with clean vents, Turbo mode and a clean install of drivers, ASUS support should check the cooling. If you have a game that runs well on someone else's G14 and poorly on yours, compare the settings: operating mode, GPU mode, refresh rate and the game's graphics options. Check that you are not running the game in a window with a capped frame rate, and that the laptop is not in Windows Battery saver, which slows the processor. Record the frame rate and the temperature with a monitoring tool so you can show ASUS support what happens under load, which speeds up a repair if one is needed.