Kakashi being able to react to the warping process doesn't make it slow. Lmao makes zero sense.
-Evading KCM Naruto from close range.
You must be registered for see links
In the scan I just posted Kakashi warped from wherever he was right to Obito. That's much faster than Sasuke who only managed to take a few steps during that process, if even. :lol Kamui's warping is far faster than Sasuke's dash who is already faster than anyone involved in this match.
The main weakness to Kamui is hitting the user while they are warping because THEY are left defenseless while warping OTHER objects. Not themselves. And even then that fails as shown against Obito. :lol The only time that ever became a weakness is when Madara had the Gudo Dama, far faster than anything in Kakuzu's arsenal, to interrupt the warping process.