[GitHub] [incubator-pagespeed-mod] conandrum opened a new issue #1881: defer_javascript slows down website?

[GitBox <gi...@apache.org>]

conandrum opened a new issue #1881: defer_javascript slows down website?
URL: https://github.com/apache/incubator-pagespeed-mod/issues/1881
 
 
   Enabling defer_javascript slows down website. Any insights? 
   Here are some metrics from https://developers.google.com/speed/pagespeed/insights
   
   41%m - 57%d
   defer_javascript ENABLED
   First Contentful Paint 0.4 s
   Speed Index 4.1 s
   Time to Interactive 4.7 s
   First Meaningful Paint 1.0 s
   First CPU Idle 1.5 s
   Max Potential First Input Delay 250 ms
   
   68%m - 94%d
   defer_javascript DISABLED
   First Contentful Paint 0.7 s
   Speed Index 1.4 s
   Time to Interactive 1.8 s
   First Meaningful Paint 1.1 s
   First CPU Idle 1.2 s
   Max Potential First Input Delay 70 ms
   
   My htaccess:
   ## PAGE SPEED OPTIMIZATION
   <IfModule pagespeed_module>
      ModPageSpeed on
      ModPagespeedLoadFromFileCacheTtlMs 31536000000
   
      ### RewriteLevel ###
      # 43-51%m - 73-80%d
      ModPagespeedRewriteLevel CoreFilters
   
      ### STANDARD FILTERS ###
      # 49-52%m - 80-84%d
      ModPagespeedEnableFilters remove_comments,collapse_whitespace,elide_attributes,trim_urls
   
      # EXTERNAL ASSETS - (REQUIRES ModPagespeedFetchHttps enable)
      ModPagespeedDomain http://fonts.googleapis.com
      ModPagespeedGoogleFontCssInlineMaxBytes 20000
      ModPagespeedEnableFilters inline_google_font_css
   
      ### ESSENTIAL FILTERS ###
      # 66-69%m - 95-98%d
      ModPagespeedEnableFilters lazyload_images
      ModPagespeedEnableFilters defer_javascript
   
      # 70-74%m - 97-98%d
      ModPagespeedEnableFilters responsive_images
      ModPagespeedEnableFilters responsive_images_zoom
      ModPagespeedEnableFilters insert_image_dimensions
   
   </IfModule> 
   ## END PAGE SPEED OPTIMIZATION
   
   

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