low speed

Hi.(sorry for my english)
I use awast 4.8 familial. Since one week my internet speed is very low. 1.5 Mo instead of 6Mo habitualy. I had test many things and at the end, I stop awast. Then my connexion accelerate immediatly. I don’t understand because I had not change anything of my config. and I had not problem before. can you help me, please?

Well, it’s not wise to disable the antivirus protection…
Which is your firewall?
Any other antivirus before avast?
Did you run a full scanning with avast?

Is it possible Avast was trying to update in the background? You might check the update settings and see if they’re set to manual or automatic. If automatic then set to manual and see if that makes a difference.

avast update shouldn’t decrease the Internet speed in that way…
Something else is happening…