it’s unlikely the wifi chip in your computer that’s failing

as the title suggest, when you are experiencing slow internet connection speed or something not so right with accessing websites. it’s not the wifi adpapter but something else.

the below suggest some of the symptoms of a failing wifi adapter/chip if it is really failing:

http://smallbusiness.chron.com/symptoms-failing-wifi-card-71204.html

on the other hand, use the tips in the link provided below to find out what causes slow internet connection:

https://www.lifehacker.com.au/2013/06/top-10-ways-to-deal-with-a-slow-internet-connection/