Caching on Windows makes CS check incredibly slow

[jrfnl]

Repost from squizlabs/PHP_CodeSniffer#3558:

Describe the bug

I've done some - not entirely scientific - benchmark checks and am finding that enabling the caching option when on Windows (not sure about other OSes), makes a CS run significantly slower.

For a CS run with a custom ruleset and the following command over 57 files:

phpcs ./inc/ --sniffs=Squiz.Commenting.FunctionComment,Universal.Operators.StrictComparisons,Generic.CodeAnalysis.EmptyPHPStatement,PHPCompatibility.ParameterValues.NewHTMLEntitiesFlagsDefault,PSR12.Files.FileHeader,Squiz.Commenting.InlineComment,WordPress.WP.PostsPerPage

These are the approximate timings I'm seeing:

Checked against	Time with cache ON	Time without cache OFF (--no-cache)
master	Time: 3 mins, 5.61 secs; Memory: 78MB	Time: 3.7 secs; Memory: 36MB

Expected behavior
I would expect a little bit of a slow-down the first time PHPCS is run with cache turned on as the cache file needs to be written, but the slow-down I'm seeing now is out of bounds.

Versions (please complete the following information):

• OS: Windows 10
• PHP: 8.1.2
• PHPCS: master, but also checked 3.6.2 tag
• Standard: custom

Additional context
I haven't done a git bisect yet to figure out if I can pinpoint the slow-down to a specific commit, but felt that the time difference is so huge and on the negative for having caching turned on, this had to be reported forthwith.

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