If you're playing on an older machine like I am, you probably experience crap FPS when Veridical Confluxes appear. Having figured NPC/area effects better, I was able to remove the glow around the Confluxes, greatly improving frame rate. The Dat is available for download here: http://ffxidats.caarrie.com/index.php?action=downloads;sa=view;down=1361
I don't have the Escha warp dats written down, but I could track them and adjust them in some way. The Escha warps are 100% glowy effects, and there are no models involved, so it would probably be better to replace them with some other kind of porter (this dat, Nyzul lamps, Adoulin waypoints, etc), though in reality, any NPC dat file would work. Feel free to ask me anything in my Workshop Thread:
www.ffxiah.com/forum/topic/44787/jeanpauls-dat-mod-workshop/
I'm not really sure what the cause is, it doesn't seem to be an older machine exclusive issue although my issue disappeared the moment I built a new PC.
If everyone who has the frame rate issue were to post their PC specs I'm sure there would be some sort of common feature though