Lel, Kishi has shown that Gai bent space to a great extent just through sheer speed which is only possible at sub relativistic to relativistic speed.....Itachi and Kakashi reacted to natural lightning which is mach 280 and above.....ethereal transmission technique is light speed, Gai creates fire just by punching which is only possible at hypersonic punching speed since he doesn't use chakra.....he has stated that Haku moves at light speed while using ice crystal mirror techniques (which makes sense as he moves due to reflection of light).....Naruto's shunshin has always been compared to hirashin which is instant.......genine lee, sasuke and one tailed Naruto have broken sound barrier and... currrent Naruto and Sasuke have speed comparable to juubi jins and Kaguya.
It is actually Bleach that hardly has any quantifiable speed feats ...just because u r faster than the eyes of other opponent doesn't mean that u r faster than another verse....people have this misconception because the animation quality of bleach is better than Naruto's anime...U_U