Inspiron 5558 Lagging heavily after recent BIOS update
I have a Dell Inspiron 5558 with Windows 10 and it has worked perfectly (I keep it in pristine condition) since it was gifted to me by my mother a couple years ago.
However, since the recent BIOS update, it's been running slow, lagging heavily (such as things I type in discord taking a full five seconds to catch up), and any audio I play crackles and has a lot of static noise, even through earbuds.
Is there any way to fix this? It's very annoying to have an update ruin the computer I've treated like porcelain these last few years (since I don't have the money to get a new one, I do whatever I can to keep this one up).