The Settings tab is accessed from Performance | Settings.
From the Performance Settings tab for a specific node, you can globally define the settings for all the modules of the Performance suite of tools: Code Acceleration, Content Caching and File Compression.
From this configuration pane, you can:
Configure performance monitoring and improve functions for a specific node
Manage Performance settings for the network from a central administrative station
Code Acceleration Enable
"On" - The Code Acceleration is active and working.
"Off" - The Code Acceleration is not in use.
The amount of memory allocated for use by the Code Acceleration for storing data structures and accelerated files.
Recommended: The memory allocated should correlate with the amount of scripts that you have, their size and complexity. Typically, 32MB is enough.
Memory Reclaim Threshold
During normal operation, some of the Code Acceleration memory may become unavailable for use. When the Code Acceleration runs out of memory, it will check how much of its memory is in use, and how much is unavailable. If the amount of unavailable memory is beyond this reclaim threshold, the Accelerator will perform an automatic restart, to reclaim all memory.
Maximum Accelerated Files
The maximal number of files that will be accelerated
Recommended: Set this value to about 20% more than the actual number of scripts on your server. Typical memory usage ratio is a few hundred KB per thousand accelerated scripts.
Extensions for PHP Files
If your PHP files end with any other extension (rather than the default *.php extension), add all the extensions here separated by commas.
"On" - Full Page Caching is active and working.
"Off" - Full Page Caching is not being used.
Maximum Cache Size
The maximum disk size allocated for caching. Occasionally and for short periods, this value may be exceeded but only until the next time that the cache cleaner deletes the files that expired.
For unlimited cache size, enter "0".
Minimum Free Diskspace
The minimum amount of free disk space that cannot be exceeded during caching. Reaching this value will end any further caching. The caching will resume as soon as the space is greater than this value.
Maximum Cached File Size
The maximum output cache file size allowed. An output cache file that exceeds this value will not be cached.
Default Cache Lifetime
The lifetime (in seconds) of a cached data. The data will be re-generated if the cached version is older than the expiration time.
Default Dynamic Caching Conditions
By default, the Dynamic Content Caching will cache each request, based on its full URI. You can modify the settings to be more general or more specific, as desired.
"On" - Partial Page Caching is active and working.
"Off" - Partial Caching is not being used.
Caching Folders Depth Level
Define the level separation of content cached in the file system (can be used with namespaces or without).
Maximum Shared-Memory Cache Size
For shared memory caching, set the maximum amount of memory allocated for caching. An error message will be printed to the web server's log when this limit is exceeded.
All files are sent to the browser as is.
Only cached files
The cached files are transferred to the browser in a GZIP format, if the browser supports the format. Other files are sent to the browser as is.
All files are sent to the browser in a GZIP format, if the browser supports the format.
Compressing all files may cause some overhead and affect the overall performance. Use "All files" if your main concern is improving the download time for the user.