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arnav-hiwarkar
9a0a198ff1
Since #595 (v0.19.0) a playing preview and Cache Frames When Idle render one frame per lane, a lane per core, each recording, submitting and reading back a whole frame on the GPU the window draws with. On a GPU that can't keep up, the window froze for hundreds of milliseconds to seconds and the playhead jumped ahead when it came back. Lanes now take a GPU frame only while fewer than a limit of them composite. The limit starts at one lane and adapts to the window's frame gaps while a preview plays: a stall (>100 ms) with lanes compositing halves it, half a second of smooth frames (<50 ms) with every allowed lane busy adds one, up to every lane; a limit that stalled is tried again only after 10 s. Frames on the CPU (Software Only, no or retired GPU, GPU memory pressure) and disk-cache hits use every lane; the pool and the viewer's frame are not limited, and frames ahead of the playhead still start first.