Something seems to have changed with this NA server recently.
I use a 150 mb sky broadband connection and yesterday the NA server was very laggy and I kept discconnecting and reconnecting and then eventually disconnecting entirely from server. In the end i just gave up. Noticed it for a couple of days now. My ping used to be around 40-60 but now hovers around the 80 mark. I already optimized PC, clearing temp directories/space/ using SG TCP Optimizer which fixed a problem i was once having crashing on the purchase terminals.
If any other game behaved like this it would be in my bin by now.
Update: Today I:
Reinstalled Ren X, optimized my ssd, cleared out the temp directories and ran ccleaner.
Played a full server on Reservoir, which gave probs yesterday, and lag was completly gone. Same server, EU. Hope this helps anyone who gets laggy/disconnecting probs.