So i've been doing a little testing. PP CC2020 is terrible with Long GOP formats. Where all previous versions worked really well (CC 2019, 2018, etc. etc.), this one falls short. That said, I do not expereience the same performance drop with ProRes or any Intra-frame codecs. Those are still as speedy as ever. Playback, scrubbing playhead, clicking through from clip to clip = no issues. When performing those same tasks on anything LongGOP, i.e. H.264 codecs and the like, its horrible. Even dropping the playback quality to 1/4, still terrible performance. What gives? As mentioned, in all previous versions this wasn't an issue. Especially for my more than capable iMac Pro and speedy Facilis Terrablock RAID array. Seems to me like something significant has changed to lose that much performance. The best part of PP was that it could handle anything you through at it. With this 2020 update, it feels like I'm back in 2005 using FCP 7. PLEASE PLEASE PLEASE fix this as quickly as possible.
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