I've had this laptop for a year and a half now and for some time I've been having issues with performance. The wifi speed is really slow even when I'm on my school's wifi. My friend got something around 130mbps on his macbook and when I tested mine I barely got 20mbps. My disk usage used to be at 100% all the time, but right now that's not happening, and I don't know why. Usually webpages load at a decent speed but sometimes it gets pretty hung up and takes a good 10 seconds to load. I've gone on the product page for my laptop and made sure to install all of the latest drivers, but nothing seems to be helping anything. I've uninstalled and reinstalled the Atheros Wifi drivers many, many times and I have not seen anything fix the issue.

Here is a link to my laptop's product page
Satellite L55t-B5278 Support | Toshiba

Also, I'm using windows 10

I'm not an idiot with computers and I've solved countless problems on my own with my desktop, but I just can't seem to find any fix for this at all. Pretty desperate at this point, I would appreciate any help I can get.