Lags and spikes. Looks like a savetates of game is heavy (1.5 MB for 7.6MB game). But Network monitor show ~225 kb/s traffic. I have 100 Mbit/s channel and other player too. 30ms ping. Netplay sync frames - 30. FBA Alpha better, but still laggy. Still no serialization for MAME? Can retroarch sync only when netplay desynced?
