Hey nice to meet another Polish dude! We use Twilio's Video SDK and their P2P rooms. This works fine for most users on desktops and good internet. When I play with friends in CA (I'm in NY), I don't experience any serious issues. Sometimes there's feedback when a user has their speakers blasting. Many of our users experience problems on mobile when there are a lot of players in the room. We're thinking about switching video providers to one with an affordable server option to improve the larger game rooms experience though.