Git stash on windows extremly slow compared to Libgit2

Question

Recently I've been using git stash many times and I've been thinking that it is really slow, even on a new repository with a single file. I've read this question about git stash slowness and this other one and tried every answer to these questions but nothing actually works.

For example I've done the following steps to reproduce it:

1. git init
2. touch file.txt
3. vim file.txt (edit the file adding 2 lines)
4. git add .
5. git commit -m "Initial commit"
6. vim file.txt (edit it again adding 1 line)
7. time git stash

Output:

$ time git stash
Saved working directory and index state WIP on master: b9454ed Initial commit
HEAD is now at b9454ed Initial commit    
real    0m8.042s
user    0m0.000s
sys     0m0.046s

8 seconds for stashing a single line is so much time. Now a test using libgit2sharp:

static void Main(string[] args)
{
    Repository repo=new Repository(@"C:\Users\UserTest\TestGitRepo");

    repo.Stashes.Add(new Signature("test", "[email protected]", new DateTimeOffset(DateTime.Now)), "Stash on master");
}

This code takes 74ms to stash the same change. If Libgit2 is that fast then it should be possible to speed up git stash command. How can I achieve this?

Actually using windows 10 64bit and git 2.11 64bits. Other git commands (like status, add, commit, etc.) work fine.

UPDATE: I've updated to git 2.13 and now it's 14,53s for git stash...

UPDATE 2: I've updated to git 2.15 and trying the same test time git stash returns real 0m6,553s. Still really slow...

Answer 1

Since Git 2.22

Since Git 2.22 the previously experimental feature is now stable and the default option.

Below Git 2.22

One year later, installing Git 2.19 I've seen a checkbox during git installation to enable the new experimental built-in stash.

In my case it works fine and I've noticed a huge performance improvement compared to the old implementation (which was using a script) and it's actually as fast as using the same command in linux.

Here the results following exactly the same steps:

$ time git stash
Saved working directory and index state WIP on master: 7a29b92 Initial commit

real    0m0,120s
user    0m0,000s
sys     0m0,015s