Just upgraded from a 2013 i7/780m to a 2017 i7/580 and am finding that this machine is actually noticeably slower on both Compressor and FCP X renders/exports due to thermal throttling of the iGPU. I have iStat Menus for temperature monitoring and fan control and Intel Power Gadget to monitor the frequencies and further temperature monitoring. I even have installed Turbo Boost Switcher to disable turbo boost and keep the CPU at 4.2GHz to try and keep temps down and prevent iGPU throttling. Even if I max the fans out, the render/export starts out blazing fast, running the iGPU (GT) at 1.1GHz. After around 3 minutes, once temperature reaches 80C with fans manually set at max, it drops GT to 0.5GHz and after 15 minutes, drops it down to 0.3GHz. During this process, the temp runs around 73-75C and the iGPU never recovers to its original clock speed. For me to render a 30:00 1080p60 H.264 in Compressor at 15,000 Kbps, it's taking 25 minutes -- whereas on my 2013 it takes 15 minutes. What I'm wondering is: would the i5/3.8 be immune to the iGPU throttling, as others have reported it runs much cooler? I love the retina screen, but with as many videos as I export during a day (I make videos for a living) this translates into up to an hour of extra processing time as compared to a 4-year-old machine!