Actually I didn't have lag really before the patch, well aside from DR and LA. But that is expected because of the high population. But after, I try to do world bosses or anything anywhere and I lag out and disconnect. I have not found any workaround or anything to solve the issue and it's got me to where all I do is meander around and do much of nothing.
But, the game and servers are very old and they're trying to find ways to fix the problem. ANet has always been on things for the most part so I have faith in them. I just have to wait it out.