I have Toshiba Satellite 15.6" with AN AM 1.4 ghz processor...4 gigs of RAM...rarely used I bought it when Windows 8 was winding down and you could upgrade to Windows 10 as part of the purchase...so say 2015 or so. Still looks new. I did the Windows 10 upgrade as soon as it was released. I have almost nothing on the HD drive. Has only been used for email and Internet. I do have MS Office 365 on it...latest version. It's not the wifi that's slow, it's loading pages or programs without even connecting to the internet. It is painfully slow. I ran Avast...it's clean. How can I speed a pc that has hardly been used up?