at the moment there's still issues that are going on with server stability (having to fix NA twice in 2 days now, along with random crashes and lag ongoing)
Is this lag you are currently experiencing, or are we speaking overall? I've talked to a few people and they mention they have almost unplayable lag right now. I have a feeling there might be a routing issue with certain variables.
I've been seeing gameplay affecting issues since the last patch with the 'server stability optimization'.
Skill cooldowns and lack of SF to use a skill isn't working correctly. The skill stays lit up and if you use it your character just freezes for a split second while the chatlog is spammed with either "cooldown not ready" or "not enough SF".
Prior to this patch, the skill would be greyed out and fully unusable. I don't know if this is due to some latency related issue or core game change in the patch, but it's a really poor experience in comparison to how it used to be.
Of course, it's also coupled with server lag spikes affecting combat (delays on hits, warping/rubberbanding of both you and enemies, getting hit out of skill hitboxes, etc). Also sometimes enemy collision boxes stay there after they die along with their icons on the minimap; makes fighting and gauging the enemies left a complete hassle.
But I guess it's fine, 'cause we get more $20 costumes while every other issue is ignored, right?
Oh and just as I was about to submit this post I started up SW and was greeted with this: 
Quality.
Edit: And connecting to the NA server after this took about 30 seconds before I was brought to the char screen. Gonna assume the game is barely playable.. never seen it like this before.