I assume the timeline is doing multiple passes at different node layers. I've noticed this behavior for years, but I've never got to the bottom of what's going on. It's not a big deal on a 2 minute edit but when it's a 30 minute program with 8K raw footage inside it, it's the difference between exporting a timeline in 5 minutes vs several hours. That becomes a major issue when I'm relying on the timeline's rendered cache to speed up exports. So unlike other editing software, I can't assume that the rendered areas are fully rendered and I can't trust that they will stay rendered. I find on big projects timeline turns blue in parts, then those blue patches become red again. I've experimented with both Smart and User modes and caching individual node, and using the Cache colour output methods. I find on long complex timelines, Resolve's timeline rendering behaves in unpredictable and weird ways.
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