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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
Some decoding APIs support delayed output or a command for decoding a frame doesn't need to be sequential to corresponding command for getting decoded frame. For instance, subclass might be able to request decoding for multiple frames and then get for one (oldest) decoded frame or so. If aforementioned case is supported by specific decoding API, delayed output might show better throughput performance.