Config schema use FileCache due to:
\Drupal\Core\Config\Schema\ConfigSchemaDiscovery uses config.storage.schema which is \Drupal\Core\Config\ExtensionInstallStorage\Drupal\Core\Config\ExtensionInstallStorage extends \Drupal\Core\Config\InstallStorage which extends \Drupal\Core\Config\FileStorage\Drupal\Core\Config\FileStorage has been using FileCache since
#2473179: Use FileCache for config storage →
However the file cache in FileStorage is a memory only cache. We could use an APCu FileCache for config schema to speed up testing (a tiny amount) because schema files do not change much and are used when writing config.
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It affects performance. It is often combined with the Needs profiling tag.
Thanks for opening this issue!
speed up testing (a tiny amount)
Let's mark this ?
I bet this caching still makes sense, how to measure it? at least, it brings parity comparing to absence of pecl yaml