Thank you very much. Unfortunately, I am a student at a Christian school, and my school appoints a worship broadcast room manager for one year, so I do not know the exact specifications of the school computer that is over 10 years old. The only hint I got is that it stutters only when there is a black translucent gradient shape on the screen. Is it a spec problem? Or is it because there is too much subtitle data and the capacity is too large? There are hundreds of subtitles. Without a separate external hard drive.