Issue #1191290 by klausi, David_Rothstein, Fabianx: system_cron() should not run hook_flush_caches(), but use a cached version. #108
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This is a straight backport of https://www.drupal.org/node/1191290.
The reason is that else e.g. features_flush_caches() runs during every _cron invocation, which can be quite slow.