Background info:
I participated in the Blitz beta and had no issues with lag.
Bugs yes, there were plenty of those, but never lag.
System Info:
Intel Core i7 6850 @3.60 ghz
24gb ram
Geforce GTX 1080
Windows 10 Professional.
Thus far since launch I have had maybe two games that are actually playable.
In every other game, for no apparent reason, I have a 3-4 second delay between the input of my commands and the execution of those commands.
Visuals are choppy at best.
I am essentially forced to give my commands based on my best guess as to what conditions will be 10-15 seconds in the future.
I have no such issues in single player.
It appears that you have completely botched your multiplayer roll-out in spite of your multiplayer beta.