How does --assume-unchanged impact git-p4?

[Corey Thompson <cmtptr@gmail.com>]

Hello,

My workplace uses Perforce, so I've started using git-p4 to interface
with it.  Some of the files included in our depot are cached
pre-compiled binaries which do a great deal of damage to git's
performance, so after some research I found that I can "git update-index
--assume-unchanged" on these files.  This is great except that now I'm
worried that this might prevent git-p4 from doing its thing when someone
else updates these files.

So am I going to miss updates to our cached binaries using this method?
Is there a better method I should be using in this scenario?

Thanks,
Corey