Just tested on my MacBook Pro with Radeon HD 6750M 1GB, OS X 10.9.2 and I have about 40 fps on Low settings and about 15 on Epic settings, with default editor layout, maximized on 1440x900 screen. That’s using a QFE we released a while back. But even without it it’s not extremely bad. The framerate varies as I move the camera about, but it’s nowhere as bad as you report. Would you mind giving me more info? Do you have 10.9.2 installed, do you have the QFE installed (UE4 Perf Woes - iMac - Platform & Builds - Unreal Engine Forums)? Is this extremely low performance limited to Blueprint lobby example? How much memory does your Radeon have? If it’s 512 MB, on some maps the driver will spend most of the time copying stuff between video and system memory.