The download speed is very slow on the MacBook Air 2012, what's wrong?

Question

WiFi

I beg you to help, I have a MacBook Air 13 2012, the Internet speed constantly drops on it, the speed is high on all computers and phones in the apartment, and on the MacBook it is either high or very low and most often low. Later he moved to another apartment, there is a completely different Internet with a higher speed, the problem is still the same, everything flies everywhere on the MacBook pro, phone, Xbox, and Eir constantly jumps strongly from 1mb to 20mb. What is the problem? what to do??

Answer 1

1) connect the 5Gz network directly
2) update the driver
3) accept