They could have animated the lightspeed 8 cuts which only needed 8 frames to show how fast they are, and they didn't.
Good job Ufotable, you are very good at hyper-fight scenes.
飛碟社本來可以只畫八張畫來展現超高速連砍，但是他們沒有，真的太棒了

Check out my another edit on nine lives blade works:
可以看一下我另外在射殺百頭電影片段的剪輯:
https:youtu.be/DubPvyMXr_c