MCCS - new Multiplayer content

Hello! I figured out what was wrong with my previous message... and there are lags due to messages from other players.

But what's with this glitch now? I'm playing through MCCS, a regular Heroes version 3.1 with only the NCF Special and Gemnod mods... in the main menu, everything runs normally.
On the simple H5 EXE and NCF EXE, everything also runs normally, but the NHF and NAF mods obviously don't work anymore.

But on the map, in battles, in the castle overview, everywhere in the game, there's an annoying lag, especially noticeable on large maps; the picture is just choppy... it's terrible.
It's impossible to play, only on the smallest maps. I didn't notice this lag at first, but how can I fix it?((( It's a nightmare.