Guild Wars 2

First of all, they are not stacking up to exploit FPS issues, they do it because it’s a basic tactic in WvW, to help with stacking boons via skills and combo fields.

Second, what are your other systems specs, CPU in particular, and your graphics settings, specifically the settings for shadows, shaders and reflections?

This isn’t really a Mac issue though. It happens for my guild/EB as well. The [physical] servers can’t handle the clustered groups and by the time it sends the position data to your computer it’s after the fact. Only way this will improve is updated code. They already limit the number of players in EB at once for this reason, so it’s not that they don’t know about the issue. It’s going to take them a bit to figure out how to fix it.

I didn’t say anything about culling. That’s a related, but still different issue than having FPS tank to 1. The whole point of culing is to NOT have FPS tank that hard.
The core issue is that the game should not drop to 1FPS. We can try and find out why, and maybe fix it. We can’t fix culling.

You still haven’t told us what CPU you use. That’s the main processor, not the graphics card.