The game is great and runs really well single player in ultra. The second I try a Blitz online though it either DCs me after major lock up and the start or plays with 1fps and 8 second delay on anything.
What is going on? Does anyone know a fix please it would be great to play online…
Is this just me then? Everyone else multiplayer working perfect?
No, seem to be a server issue.
Coop is perfectly fine, so is coop blitz (firefight) and the occasional 2v2 blitz work fine too but 90% of the time I either drop due to lost connection or game looks like its running between 5-15 FPS during online play 
Please check to see if you have the Halo Wars 2 Blitz Beta installed, if you do, try uninstalling it and then play a few games to test.
I have started a thread specifically for feedback on this issue so please post the results of this test there to consolidate our results.
I had already uninstalled the Blitz Beta before playing Halo Wars 2 and I have this FPS drops. Sorry.