I've checked a few projects here between them, and the clang build is ~0.5% higher cpu load on average for me. 3.5ghz i5.
I tried one project on a 2.3ghz i7 macbook pro, and the clang version was noticeably worse. Large project at 67% peak for ICC and 75.5% with clang and occasional dropouts.
I don't see any differences in video window performance, so I assume this isn't implemented yet?
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