Here's the problem: XDCAM is highly compressed and has absolutely no hardware acceleration at all from either your CPU or your GPU. This forces everything on your CPU–in software-only mode, at that. This is because although your GPU technically hardware-accelerates MPEG-2-encoded video like your footage, no video editing software currently utilizes that capability (likely because current NLE software treats all MPEG-2 video as legacy), effectively restricting its use to video player software. And then, interlaced video is even more CPU-intensive than progressive-scan video to process in an NLE program simply because the program itself has to perform both deinterlacing and reinterlacing all on the fly, especially after effects are added on. This can, and does, result in dropped frames during playback. Finally, the dropped frames indicate that your media drive (that is, the drive that you have your working footage located at) may be too slow to handle that footage, especially with the additional load from the NLE.
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