# ProblemGit, Mercurial, and Subversion repositories are unnecessarily reinitialized for each test.- We're not utilizing session-based scoping.  - A single initial repo could be created, then copied to [`tmp_path`](https://docs.pytest.org/en/8.3.x/how-to/tmp_path.html#the-tmp-path-fixture) using [`shutil.copytree`](https://docs.python.org/3/library/shutil.html#shutil.copytree) ([source](https://github.com/python/cpython/blob/v3.13.0/Lib/shutil.py#L550-L605)).Issue#471 highlighted this inefficiency, where benchmarks showed tens of thousands of redundant functional calls.# Improvement```❯ hyperfine -L branch master,pytest-plugin-fixture-caching 'git checkout {branch} && py.test'Benchmark 1: git checkout master && py.test  Time (mean ± σ):     32.062 s ±  0.869 s    [User: 41.391 s, System: 9.931 s]  Range (min … max):   30.878 s … 33.583 s    10 runsBenchmark 2: git checkout pytest-plugin-fixture-caching && py.test  Time (mean ± σ):     14.659 s ±  0.495 s    [User: 16.351 s, System: 4.433 s]  Range (min … max):   13.990 s … 15.423 s    10 runsSummary  git checkout pytest-plugin-fixture-caching && py.test ran    2.19 ± 0.09 times faster than git checkout master && py.test```# Changes## Pytest fixtures overhaul1. Create a base VCS repo.2. For subsequent tests, copy and modify from this template.