Q:
Excess of visual effects.
Well, you can olways consider reducing the graphic settings. That should help a bit.
I’m not sure he’s complaining about frame rate. He means all the effects on screen make it hard to figure out what’s going on because they visually block your view. I don’t think there is a way. A good number of players complained about this at release, when players were much more densely clumped in the initial levelling wave, and Anet never responded.
Without having tried it myself: I’ve heard it suggested that you turn off post processing. It won’t reduce the quantity of particles on your screen, but it should diminish the amount of light they produce, which goes a long way for adding clarity.
One of my guildmates has all particle effects turned off but he did it via his graphics card. Not sure how or even if you can do that as well.