I understand that people were able to exploit the Temporal Curtain’s swiftness buff in the past and they made it so that it does not stack with itself or any other swiftness; I might be wrong on this info.
Is this still an issue? Why does it not stack swiftness duration if you already have it running? If you have even 1 second of swiftness remaining and you pass the Temporal Curtain, your swiftness duration will not be buffed at all. The only way to get swiftness from it is if you do not have any swiftness on you at all when you run pass the Temporal Curtain.
I post this in the hopes that the developers take another look at this issue. I am sure mesmers everywhere would very happy with this quality of life change were it fixed to stack with current swiftness duration.