Ubuntu LAMP, WordPress, ModPageSpeed configuration in /etc/apache2/mods-enabled/pagespeed.conf which works with W3 Total Cache and StackPath CDN.

pagespeed.conf

<IfModule pagespeed_module>

  <Location /wp-admin/>
    ModPagespeed Off
  </Location>

  ModPagespeed On
  ModPagespeedAllow all

  ModPagespeedFetchHttps enable

  ModPagespeedSslCertDirectory /etc/ssl/certs/

  ModPagespeedRewriteLevel CoreFilters

  ModPagespeedDomain https://coherentlogic.com
  ModPagespeedDomain https://cdn.coherentlogic.com

  ModPagespeedPermitIdsForCssCombining *-css

  ModPagespeedEnableFilters remove_comments
  ModPagespeedEnableFilters defer_javascript
  ModPagespeedEnableFilters rewrite_javascript
  ModPagespeedEnableFilters extend_cache
  ModPagespeedEnableFilters resize_rendered_image_dimensions
  ModPagespeedEnableFilters rewrite_domains
  ModPagespeedEnableFilters rewrite_images
  ModPagespeedEnableFilters convert_jpeg_to_webp
  ModPagespeedEnableFilters convert_to_webp_lossless
  ModPagespeedEnableFilters convert_to_webp_animated
  ModPagespeedEnableFilters recompress_webp
  ModPagespeedEnableFilters convert_gif_to_png
  ModPagespeedEnableFilters recompress_png
  ModPagespeedEnableFilters convert_png_to_jpeg
  ModPagespeedEnableFilters convert_jpeg_to_progressive
  ModPagespeedEnableFilters recompress_jpeg
  ModPagespeedEnableFilters insert_image_dimensions
  ModPagespeedEnableFilters inline_images
  ModPagespeedEnableFilters inline_google_font_css
  ModPagespeedEnableFilters flatten_css_imports
  ModPagespeedEnableFilters rewrite_css
  ModPagespeedEnableFilters inline_css
  ModPagespeedEnableFilters canonicalize_javascript_libraries
  ModPagespeedEnableFilters combine_javascript
  ModPagespeedEnableFilters combine_css
  ModPagespeedEnableFilters include_js_source_maps
  ModPagespeedEnableFilters collapse_whitespace
  ModPagespeedEnableFilters lazyload_images

  SetOutputFilter DEFLATE
  AddOutputFilterByType MOD_PAGESPEED_OUTPUT_FILTER text/html text/html text/plain text/xml application/xml application/xhtml+xml text/javascript text/css application/x-javascript application/x-httpd-php

  ModPagespeedFileCachePath            "/var/cache/mod_pagespeed/"
  ModPagespeedFileCacheSizeKb          102400
  ModPagespeedFileCacheCleanIntervalMs 3600000
  ModPagespeedFileCacheInodeLimit      500000

  ModPagespeedLoadFromFileCacheTtlMs 604800000

  ModPagespeedMemcachedServers "localhost:11211"

  ModPagespeedImageMaxRewritesAtOnce -1

  ModPagespeedCreateSharedMemoryMetadataCache "/var/cache/mod_pagespeed/" 102400
  ModPagespeedDefaultSharedMemoryCacheKB 102400

  ModPagespeedMapOriginDomain localhost coherentlogic.com

  ModPagespeedListOutstandingUrlsOnError on

  ModPagespeedStatistics on

  ModPagespeedDisallow https://coherentlogic.com/pwa-sw.js
  ModPagespeedDisallow https://coherentlogic.com/*.pagespeed.*.js
  ModPagespeedDisallow https://coherentlogic.com/pwa-manifest.json

  ModPagespeedLoadFromFileRuleMatch disallow .*$
  ModPagespeedLoadFromFileRuleMatch allow \.css$
  ModPagespeedLoadFromFileRuleMatch allow \.js$
  ModPagespeedLoadFromFileRuleMatch allow \.gif$
  ModPagespeedLoadFromFileRuleMatch allow \.png$
  ModPagespeedLoadFromFileRuleMatch allow \.jpg$
  ModPagespeedLoadFromFileRuleMatch allow \.webp$

</IfModule>