From what I have read it appears that lag has picked up to some degree for everyone. The towns are much more crowded now so walking through them is a bit more jumpy and I would say crafting could be a bit slower if you have a slower computer. Also they have shut down the Ulduh Inns again as well as making "certain parts of the world" un-accessible due to increased lag issues as of the March 29 maintenance notes.

If you would like more information regarding you specifically on this matter I would suggest giving ppl as much information as you can about your set-up. What CPU and Graphics card are you running? How much RAM? What do you have some of the major game settings at (general draw quality, shadow detail, Ambient Occlusion, Depth of Field, Multi-sampling). Once we know this we can suggest areas where you can turn things down to optimize the game without loss of quality or if you really are needing some new hardware to run the game in its current state. They are going to optimize the engine at 2.0 so I agree that you don't want to spend a lot of money on parts to run the game in its current state.