richardkazuomiller,
You have a fast machine and the screen is 1080p, I would not expect the performance in portrait to be much worse than in landscape.
I can't see anything obvious in the logs, just concerned about a 0x0 resolution appearing at a certain stage right after rotating the screen.
I'd try to change the resolution a few times then going to a different rotated resolution to check if the issue is triggered by specific transitions.
Also is the performance issue depending on the application? Is it connected to power states (resuming from sleep)?
Carlo
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