[BUG] Installing a single git dependency takes 30 seconds

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

When using npm 7 installing a single git dependency takes greater then 30 seconds

$ npm i optoolco/_base#be9c5f7 -S
npm http fetch GET 404 https://codeload.github.com/optoolco/_base/tar.gz/be9c5f727a4d94a95cee547d1cf761f193539806 235ms (cache skip)

changed 1 package in 37s

This is a private git dependency over git+ssh

For some more context, the repository is quite small

$ npm ls --prod --depth 999 | wc -l
75

$ npm ls --depth 999 | wc -l
100

I went into an empty directory and ran the same install command to see how long it takes there.

~/optoolco/foobar
$ npm i optoolco/_base#be9c5f7 -S
npm http fetch GET 200 https://registry.npmjs.org/ini 22ms (cache hit)
npm http fetch GET 200 https://registry.npmjs.org/@optoolco%2ftonic 25ms (cache hit)
npm http fetch GET 200 https://registry.npmjs.org/node-fetch 23ms (cache hit)
npm http fetch GET 200 https://registry.npmjs.org/tar 24ms (cache hit)
npm http fetch GET 200 https://registry.npmjs.org/@optoolco%2fcomponents 29ms (cache hit)
npm http fetch GET 200 https://registry.npmjs.org/chownr 16ms (cache hit)
npm http fetch GET 200 https://registry.npmjs.org/minipass 16ms (cache hit)
npm http fetch GET 200 https://registry.npmjs.org/mkdirp 14ms (cache hit)
npm http fetch GET 200 https://registry.npmjs.org/minizlib 16ms (cache hit)
npm http fetch GET 200 https://registry.npmjs.org/fs-minipass 18ms (cache hit)
npm http fetch GET 200 https://registry.npmjs.org/yallist 15ms (cache hit)
npm http fetch GET 404 https://codeload.github.com/optoolco/opkit-node/tar.gz/a79014a348914c5a93a932d69a3609d3c60120d2 305ms (cache skip)
npm http fetch GET 404 https://codeload.github.com/optoolco/_base/tar.gz/be9c5f727a4d94a95cee547d1cf761f193539806 306ms (cache skip)

added 13 packages in 36s

Then I ran a similar command, to install a different version of the git dependency and received

$ npm i optoolco/_base#459cbb1 -S
npm http fetch GET 404 https://codeload.github.com/optoolco/_base/tar.gz/459cbb18b6d3382b7d84fb36a17cc64b8a5e35eb 386ms (cache skip)

changed 1 package in 37s

I'm suprised installing a single git dependency takes 37 seconds.

Expected Behavior

For an install of a single dependency to take less than 5 seconds

Steps To Reproduce

1. Install a git dependency
2. Wait a long time.

Environment

• OS: Linux
• Node: 14
• npm: 7.24.1

Start by reproducing the private git dependency install with Node 14, npm 7.24.1, and Linux, comparing the populated and empty directories described in the issue. Trace where the roughly 37-second delay occurs; done means the single dependency installs in under 5 seconds without regressing the documented cases.