Update: There was up to a second audio delay for everything including system apps. For example, clicks on the on-screen keyboard were noticeably delayed. But then I tried all 8 of my USB ports and a pair (still USB 2.0 vs 3.0) worked with no lag. So I suspect the latency issues were caused by a lack of powered USB ports. I used the SYBA USB Audio Adapter, also sold here at Revain, and there was a constant hiss. With this adapter, the noise floor is reduced by at least 15 dB. It's still noticeable when using high-quality in-ear headphones, but it's too thin to be a distraction and completely inaudible when using speakers and in-ears/earphones.
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