The LocalVFSService and SwitchableLocalFileSystem components include checksum caching features. Calculated checksums are stored in memory, and they are occasionally written to or retrieved from a single file. JournalingFileSystemService components use this feature if it is enabled on the LocalVFSService to which they point.

This feature is useful only for file systems that have large numbers of files, and it is disabled by default, though enabling it does not adversely affect file systems with small numbers of files. It is highly recommended for the WWWFileSystem component on the agent if significant numbers of assets (more than 1000) are deployed to that component. It is enabled by default in the WWWFileSystem component on the PublishingWebAgent.

The following properties control this feature: