I'm noticing that the keyboard commands, Insert & Overlay from the source monitor is very slow, almost useless. I've tested various different codecs and for the most part this makes little difference. However, using my mouse, dragging from the source monitor, there is no lag, the selected clip portion will drop into the timeline instantaneously.
The test I'm running is on a fresh install of Premiere 2018, in a new project.
PC
i9 7900X 3.31GHz
128 GB RAM
GTX 1080 Ti
SSD for all scratch disks
32TB Thunderbolt 3 Promise RAID for media storage (1500mb read and write speeds)
The information on use of the GPU is very clear ... and there's a list of GPU accelerated effects, things like Warp Stabilizer, re-sizing, color correction (Lumetri) ... but the GPU is not used for basic decompression/encoding (playback).
So if you're not doing anything involving the GPU, it doesn't do anything. You can of course post a feedback request that they add more items to the GPU workload ... they do add things over time.
For me this problem also extends to simply loading and scrubbing clips in the source monitor. I'm generally working with ProRes 422 HQ media. Used to fly on my machine. Now sticks like no other.
Go to the UserVoice system they now have, search for similar bug reports, and pile on ... add comments, vote, whatever. Give it more comments and more specifics.
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