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Our team use videotool box to do hardware-accelerated decoding and encoding. From iphone 6 to 7 plus, the performance of encoding increases, and it takes less time to transcode a video. However, the time spent on VTCompressionSessionEncodeFrame increases drastically on iphone 8 and newer models. For example, it takes about 650 us to encode a 720p frame on iphone 8 but 4100 us on iphone xs max. The other problem is, when i compare our app to a simple video recording app (both encode in 1080p), the time we spent on VTCompressionSessionEncodeFrame is almost 8 times as the recoding app. Is this normal?