Typing in Facebook (with Firefox) became extremely slow

Hi, I?m more experiencing on Facebook messenger/comments but also on other sites like google translator..
It looks the antivirus catch my text, send it osomethere online to control it, and only after that ita appears on the box wehre Im typing. Making experience with computer extremely unpleasant, lot ot time wasted.. I can wait even 5 seconds to see the text.
The first time I’ve experienced it I uninstalled Kaspersky antivirus and magically typing text bacem promplty and super fast (even to send it). Then installed it again (clean installation), at the beginning was fast too.. but day after day become slower.
How can I disable completely the keyboard check? My antivirus **should** not check what I’m typing!
Thanks