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Yes, that happens to me too, but it doesn't take long. It's identifying the container and loading the buffer at that moment. If you notice while it's loading and you go to the subtitles section, they don't exist until the file is loaded into memory; that's why it takes longer. Although my files are 4 GB in MKV format, and it doesn't take 30 seconds like you say. It does take a while, but only about 10-15 seconds at most.