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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