A rather strange issue. When I holding any key (skills, loot filter, inventory…) there is a micro-interruption, which is not very unpleasant, but there is one thing. If this happens while using the Focus skill, it goes on cooldown and leaves me without mana.
At first I thought the problem was with the keyboard, after testing online and in some other games, there was no such strangeness, only in this game. I also checked the offline mode, thinking that the Internet connection was to blame, but this lag was also present there.