Is it somehow related to file buffering?
Are you using BSplayer FREE or PRO? If you are using BSplayer Pro and you have activated buffering in BSplayer preferences (maybe with a high amount of mem) it's normal, otherwise it may depend on the codec used...
Does it lag with every movie or only with some types?
Can you tell us which codec is used to decode the videos? (while a video is playing, right-click on BSplayer window -> Options -> Filters -> Advanced)
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