is my computer or lichess is very slow in this days

#3 I see you say you already formatted your hard drive. You might be joking.
Formatting is the last solution, in some serious cases. Backing up and reinstalling everything is not fun.

I can not install anything (maybe because I had a virus) and as the computer was very slow lichess me, I decided to format

Today lichess is lagging all day.
Ping 80-100 and then suddenly can grow up to 300.