The new client improved the performance on 1440p quite a lot i think, coming from a late 2012 27" iMac i have now on my new iMac same size model the same fps as on the old one but at 2880p. TL;DR Performance on 1440p has significantly improved and is also more stable now(even in big PvE events), i dunno if that is due to the change of the gpus from a gtx 680mx to a pro 580 or if the newer cpu contributed a lot to this.Now i just wish that the game could MT like when the client is patching (350% cpu usage)