Page Speed Cache Life

[Atiqul Bari Chowdhury]

Hi

What is the default cache lifetime for pagespeed "extend cache"?

Everyday when I test my site "magazinestaging.contentpriest.com" the page load time is high at first go, and becomes faster from next runs (I am using chrome's console and cache is disabled).

My guess is that pagespeed cache lifetime is not behaving. How do I deal with it (my server is apache 2.4x, mod_http2 activated)

Here are my configuration files

Pagespeed main configuration

<IfModule pagespeed_module>

    # Turn on or off the module

    ModPagespeed on

    # Enable https fetching

    ModPagespeedFetchHttps enable,allow_self_signed,allow_unknown_certificate_authority,allow_certificate_not_yet_valid

   

    # We want VHosts to inherit global configuration.

    ModPagespeedInheritVHostConfig on

    # Direct Apache to send all HTML output to the mod_pagespeed output handler.

    AddOutputFilterByType MOD_PAGESPEED_OUTPUT_FILTER text/html

    

# The ModPagespeedFileCachePath directory must exist and be writable

    ModPagespeedFileCachePath            "/var/cache/mod_pagespeed/"

    # LogDir is needed to store various logs, including the statistics log

    ModPagespeedLogDir "/var/log/pagespeed"

  

    # A portion of the cache can be kept in memory only, to reduce load on disk

    ModPagespeedCreateSharedMemoryMetadataCache "/var/cache/mod_pagespeed/" 51200

    # Override the mod_pagespeed 'rewrite level'. The default level

    ModPagespeedRewriteLevel PassThrough

    

    # Extending expiry

    ModPagespeedRewriteDeadlinePerFlushMs 100

# Other defaults (cache sizes and thresholds):

    ModPagespeedFileCacheSizeKb          1000000

    ModPagespeedFileCacheCleanIntervalMs 3600000

    ModPagespeedLRUCacheKbPerProcess     1024

    ModPagespeedLRUCacheByteLimit        16384

    ModPagespeedCssFlattenMaxBytes       20000

    ModPagespeedCssInlineMaxBytes        5000

    # ModPagespeedCssImageInlineMaxBytes   0

    # ModPagespeedImageInlineMaxBytes      3072

    # ModPagespeedJsInlineMaxBytes         2048

    # ModPagespeedCssOutlineMinBytes       3000

    # ModPagespeedJsOutlineMinBytes        3000

    ModPagespeedMaxCombinedCssBytes      50000

    ModPagespeedMaxCombinedJsBytes       150000

    # Limit the number of inodes in the file cache. Set to 0 for no limit.

    # The default value if this paramater is not specified is 0 (no limit).

    #ModPagespeedFileCacheInodeLimit        500000

   ModPagespeedEnableFilters canonicalize_javascript_libraries

  

   

  

    # These handlers are central entry-points into the admin pages.

    # By default, pagespeed_admin and pagespeed_global_admin present

    # the same data, and differ only when

    # ModPagespeedUsePerVHostStatistics is enabled.  In that case,

    # /pagespeed_global_admin sees aggregated data across all vhosts,

    # and the /pagespeed_admin sees data only for a particular vhost.

    #

    # You may insert other "Allow from" lines to add hosts you want to

    # allow to look at generated statistics.  Another possibility is

    # to comment out the "Order" and "Allow" options from the config

    # file, to allow any client that can reach your server to access

    # and change server state, such as statistics, caches, and

    # messages.  This might be appropriate in an experimental setup.

    <Location /pagespeed_admin>

        Order allow,deny

        Allow from localhost

        Allow from 127.0.0.1

        SetHandler pagespeed_admin

    </Location>

    <Location /pagespeed_global_admin>

        Order allow,deny

        Allow from localhost

        Allow from 127.0.0.1

        SetHandler pagespeed_global_admin

    </Location>

    # Enable logging of mod_pagespeed statistics, needed for the console.

    ModPagespeedStatisticsLogging on

    # Page /mod_pagespeed_message lets you view the latest messages from

    # mod_pagespeed, regardless of log-level in your httpd.conf

    # ModPagespeedMessageBufferSize is the maximum number of bytes you would

    # like to dump to your /mod_pagespeed_message page at one time,

    # its default value is 100k bytes.

    # Set it to 0 if you want to disable this feature.

    ModPagespeedMessageBufferSize 100000

</IfModule>

Pagespeed Virtual Host Configuration

#MOD PAGESPEED SETTINGS

<IfModule pagespeed_module>

#ModPagespeedDomain https://magazinestaging.contentpriest.com

    ModPagespeedSslCertDirectory "/etc/letsencrypt/live/magazinestaging.contentpriest.com/"

    ModPagespeedEnableFilters add_head

ModPagespeedEnableFilters inline_import_to_link

#ModPagespeedEnableFilters move_css_above_script

ModPagespeedEnableFilters combine_css

ModPagespeedEnableFilters rewrite_style_attributes_with_url

ModPagespeedEnableFilters fallback_rewrite_css_urls

    ModPagespeedEnableFilters rewrite_css

ModPagespeedEnableFilters flatten_css_imports

    ModPagespeedEnableFilters prioritize_critical_css

ModPagespeedEnableFilters rewrite_javascript

ModPagespeedEnableFilters combine_javascript

ModPagespeedEnableFilters inline_google_font_css

ModPagespeedEnableFilters extend_cache

    ModPagespeedEnableFilters local_storage_cache

</IfModule>

[Joshua Marantz]

There's two sides of caching in PageSpeed.  Browser-side caching should be 1 year, but that only works with a warm server-side cache.  Server-side caches may be cold because of the origin cache TTL, or because of server-side cache eviction.

Please read https://modpagespeed.com/doc/filter-cache-extend for more details on this.

-Josh

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