When you call \Drupal::service('date.formatter')->format($timestamp, $type = '', $format = 'd.d.d.d') Drupal tries to load the date format based on the type because it is not custom but will not found any format for empty string. This can lead to unnecessary calls.
See profiler images before/after in
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Set missing datetime type
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Teach people via phpdoc non-empty-string (phpstan) and set internal the type to custom when format is provided or medium, when not.
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11.0 🔥
datetime.module
It affects performance. It is often combined with the Needs profiling tag.
Ran the test-only feature and unfortunately it passed when it was expected to fail. So think the test needs a little tweaking