Itachi Uchiha and Neji Hyuuga: The fastest hands in the west
I believe these two get overlooked when it comes to just how fast they can move their hands. Let's start with Neji.
According to the databooks, the 8-Trigrams: 64 Palms is a high speed combo of precise strikes that seem to land in an instant with the opponent incapable of reacting to it's flurry of strikes.
Evidently, none of Hinata's strikes had any effect on Neji and Naruto questions this
With that said, prior to learning the 64 Palms, Neji was fast enough to strike and block Hinata's chakra points since the beginning of their battle without her, the Jonin, or Hiruzen noticing this.
In the anime version of this scan, Neji dispatches 2 water clones of Kisame simultaneously with a single 64 Palms combo. The manga shows 3 clones but doesn't explicitly show that it was 64 Palms but perhaps it's insinuated.
Manga https://imgur.com/a/cHNMXPK
Anime, Timestamp- 6:17 https://youtu.be/LtDkWCwHpfs?si=kJVWD9hSHWaFXQxU
Now for Itachi.
Twice he was able to make handseals too fast for veterans of 3-tomoe Sharingan users to perceive.
Itachi was able to weave handseals for both a Water Style jutsu and a clone in an instant. Kakashi nor Kurenai notices.
Itachi emulates this same feat against Sasuke during a shuriken jutsu shootout
This is why Neji has always bested Lee in sparring. Lee has higher movement speed but Neji has higher striking speed. Also, this is why Edo Itachi was capable of throwing hands with KCM Naruto whilst casually holding a conversation.
I know it's not much of a post, but I wanted to share these overlooked feats that literally no one ever talks about. So that's all. Hope you all have a great weekend!