Manual:$wgCheckSerialized

From Linux Web Expert

<translate> Cache</translate>: $wgCheckSerialized
Check if serialised files are up to date.
<translate> Introduced in version:</translate>1.12.0 (r27983)
<translate> Removed in version:</translate>1.16.0
<translate> Allowed values:</translate>(boolean)
<translate> Default value:</translate>true

Details

Set to false if you are thorough system admin who always remembers to keep serialized files up to date to save few mtime calls.