extremely slow on windows

[asottile]

this action adds significant overhead to getting set up, I don't really know why but I tried comparing it in an empty repo against time git clone ...

• actions/checkout@v3 (an empty repo from github): 11+ seconds
• time git clone --depth=1 (an empty repo from github) (on a windows-latest runner): .613s
• actions/checkout@v3 pre-commit/pre-commit: 37+ seconds
• time git clone --depth=1 https://github.com/pre-commit/pre-comit (on a windows-latest runner): .802s

I get that windows tends to be slower than the linux runners, but this feels unacceptably slow. even linux feels slower than it should be (actions/checkout@v3 in pre-commit takes 2 seconds there)

here's the yaml that I used to test this (will probably delete the empty repo above since I just wanted to see how long it takes):

on: push
jobs:
  main:
    runs-on: windows-latest
    steps:
    - uses: actions/checkout@v3
    - run: |
        set -x
        time git clone https://github.com/asottile/test-plz-ignore --depth=1
        time git clone https://github.com/pre-commit/pre-commit --depth=1
      shell: bash

[asottile]

I tried writing my own, and it's still pretty unexplainably slow -- but still 3x faster on windows and 2x faster on linux than actions/checkout -- https://github.com/asottile/workflows#githubactionsfast-checkout

[BrettDong]

I profiled the actions/checkout@v3 on Windows runners a bit with ETW. Looks like even loading the node.exe PE image from disk to memory could stall the workflow for a couple of seconds! On the graph, only during 11s - 23s are git and git-remote-https doing real useful work. The first ten seconds are all overhead on something.