'git status' on NFS performance regression in 1.7.0

Hi,

I noticed that 'git status' in version 1.7.0 is much slower than in 1.6.2.5
on large work trees on NFS - averaging ~13 seconds runtime vs. ~2 seconds.
I did a bit of debugging and found that 'git status' apparently doesn't use
the multi-threaded preload_index any more, although some other commands
like diff still use it.  Was it intentionally dropped from 'git status'?

James