So I've been having some trouble recently with my Acer Nitro 5, although it hasn't been seriously vexing to me, it's getting on my nerves. Whenever I make an update, be it on a Windows update or my graphics card update (via AMD Radeon), I always restart my computer after it's completed as it tells me to. When I restart after a graphics card, my computer functions a lot faster than I expect it to, YouTube plays videos quickly than they normally do and my installed video player allows a lot faster playback, especially when skipping ahead.
However, when I restart my laptop again after the first restart, everything reverts back to the way it was, with programs getting slower, YouTube becomes laggy with 60fps videos and playback is noticeably slower. I'm annoyed by this because my laptop clearly can function at this high level, and yet whenever I go on it after booting it up again it goes back to this slow state. The same goes for when I rollback my graphics device via device manager - after a restart it functions fast, after the next restart it goes slow.
I'm not sure what's causing it and help would be very much appreciated!

Specs:
Model: Nitro AN515-42
Processor: AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx 2.00 Ghz
Processor core: Quad-core
Installed memory (RAM): 12.0 GB (10.9GB usable)
System type: 64-bit, runs on Windows 10