Multiplayer Black Loading screen

Alright so before the latest patch multiplayer worked fine for me. No huge waiting times, no lags no nothing. Since the new patch if I join a multiplayer game after the normal loading screen comes the black screen . The game is still loading (green thingy bottom right) and it enters the map after like 5-10 minutes! And when in the map it lags (mostly when i dodge atacks with my archer and stuff like that), not too much but it's still annoying. Any fixes?