The online multiplayer system has stalls and halts
We were testing the online multiplayer system using my Creepy Invaders test project here: https://github.com/haviital/CreepyInvaders-for-Wasm4 .There were 2-3 simultaneous players in different locations. Here are the findings:
1) Quite frequently there were short stalls in the whole game, about 1 second each, several seconds in between the stalls.
2) At least once, there also happened longer hanging which lasted tens of seconds. The game was stopped at that time.

Here are the latency values in the "enter" menu:
Player 1  255 ms
Player 2  158 ms
 
