CPU spinning during V-sync on DesktopGL?

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With V-sync on, the DesktopGL build of my game often maxes out a processor core, whereas the DirectX build has the expected low CPU usage. I’m wondering if there’s something about the DesktopGL version that necessitates CPU spin-cycling to synchronize with the vertical retrace that the DirectX version doesn’t need or doesn’t do.

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was this a regression from 3.80? which platfroms?..