Git status slow on VMWare guest but not host

I am running an Ubuntu Lucid guest inside VMWare Player on a Windows XP machine, using a shared folder. git status is slow in the VM (24 seconds) but fast on the host machine (0.06 seconds) Any idea why?

More details:

• My repo is about 620 MB (obtained by doing du -hs . in the guest OS)
• I've tried running git gc as described here, but it made no difference:

Counting objects: 3604, done.

Compressing objects: 100% (1069/1069),

done. Writing objects: 100%

(3604/3604), done. Total 3604 (delta 2143), reused 3604 (delta 2143)

Removing duplicate objects: 100%

(256/256), done.

• My repo contains lots of CSV files as well as code - is this a bad idea?
• On Windows host I am using PortableGit-1.7.2.3-preview20100911
• On Ubuntu guest I use Git version 1.7.0.4 installed from aptitude
• On Ubuntu开发者_运维知识库 guest I am sharing a folder from the windows host using the VMWare shared folder facility
• On Windows guest I have no choice but to have Sophos running, but I temporarily turned off "on-access scanning" and it made no difference.
• I originally had problems with the guest clock running slow, but this was fixed with grub options nosmp noapic nolapic as described here.

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Shared Folders have a fair amount of overhead, since you're crossing the guest<>host boundary. I'm not super-familiar with the internals of git, but I would assume it does a lot of fairly small operations, involving a relatively high amount of per-operation overhead. You could try doing a git repack to reduce the amount of individual objects (files), might help a bit.

Is it imperative that you share the repository between guest and host?

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1/ Read access are generally slower through a VM than a native OS

2/ git status is slow when the repo has submodules: do you have any?
With git1.7.2+, you can ignore those with the --ignore-submodules option.