It's obvious that converting this filmed-as-silent opus to synchronized-score-& effects was an afterthought. The synched sound required a constant speed, and 24 frames per second was the new sound standard. Unfortunately, the picture was shot at a slower silent rate, and the speeded-up sound presentation has jerky and unnatural movement that detracts from the artistry and grace of this handsome production and makes the drama less effective. Many of us have become so accustomed to seeing silent films run at the wrong speed that "Don Juan" can be taken in stride, but I for one find it almost unwatchable. Don Jose's death, and the climactic swordfight with Count Donati later on are positively grotesque at this speed. Fortunately, as with many silents available on YouTube, one can adjust the speed to 75% and the music doesn't really suffer by it.
