Slow wifi

Which phone u have?

Your friends also have d same wifi network or??
Also did you check any update is pending?When did u notice this after any updation?

Try to forget your current wifi profile and restart your router and add the wifi profile again.Check the signal strength that you're getting.
Also clear the background apps.
Install a speed check apps like fast or speedtest.Check the wifi connectivity speed.
Nothing is helping try to reset your phone and try.(Make sure u do a backup before that).

: )