Firefox is going slow

I had a problem with Firefox.
I wanted to browse YouTube but it was sooo slow and soon it said: We couldn’t connect to the server. I looked for other pages like Reddit or the Zorin forum and the same thing happened. In Win10 it goes normal. Do you know what it could be?

Any suggestions here help?

To add to the suggestions that Carmar posted, you may also disable IPv6 to see if that helps.

Nevermind, I just restarted Zorin and now it’s normal again :stuck_out_tongue: