I absolutely love Command-T, and it's served me so well over the last
year and a few months. Its native Ruby C extension makes it super fast,
much faster than CtrlP.
That said, it can take 2-3 seconds to initialise if its cache is empty,
so when I start a new Vim instance or clear Command-T's cache after
adding or removing files or switching to a git branch that's very
different, I have to wait for it to do its thing.
This initialisation time really got on my nerves last week when I
constantly had to clear Command-T's cache for some reason in order for
it to list the files I was looking for, resulting in more waiting than I
would have liked.
Because of this, I went looking around at other options to test their
speed. I've settled on Thoughtbot's pick(1) after testing out different
fuzzy finder plugins.