Are you using a PRO or a FREE version?
If you are using a PRO version, maybe its the buffering that is causing this problem. ("...HDD activity increases much more than a normal smooth playback")
The solution would be to increase the playback priority and reduce the buffering thread priority, so that playback has priority over buffering.
Or you can disable buffering altogether.
@J7N: BS.Player will never start playback, until it will finish reindexing of entire video file.
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