[rawrster]

Quote:

I would say the CK90Pro and CK10 are equally fast and the CK100 is not far behind. The CK10/CK90Pro are the fastest earphones I've personally tried.

I agree. The CK90PRO, CK10 and CK100 are all quite fast although the CK100 is very expensive and the CK90PRO doesn't have great build quality. The CK10 has great build and not as expensive in the low to mid $200 range

 

[Pianist]

IMO Shure SE530 and EarSonics SM3 are also really, really fast. Q-jays are fast too. Any other balanced armature driver based IEMs are also inherently fast. Dynamic driver ones are slower, but there are some that approach BAs in speed like Hifiman RE0 and RE252.