The slowest is three times slower than the fastest! That’s not almost identical at all, and could easily be the difference between a useable interface and an unbearable one...
I'm not going to care about the difference just because "omg one number is 3x another number!?!"
Again, if you have a reason the speed matters, then it matters. The specific numbers here are not relevant to my argument, which boils down to: being "slow", in and of itself, is meaningless.