Why does the DVD player read burnt discs very slowly, very pixilated as if having a problem reading discs?¶

You may back up your DVD on your hard disk first, and then play it with PowerDVD or WinDVD. Please select the "movie-only copy" or "Split one DVD-9 movie to two DVD-5s" copy mode. You can test if you get the same problem.
Or try the followings to burn the movie again:
Please copy your DVD movie to the hard disk. Then you can rip the DVD movie to your HDD.
If the video files play fine from the HDD, you can burn it to the blank disc with Open SmartBurner or other burning software coming with your burner. If it can't, please try other movies instead.
As for Open SmartBurner, please download it from https://www.dvd-cloner.com/download.html

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Why does the DVD player read burnt discs very slowly, very pixilated as if having a problem reading discs?¶