I'm trying to achieve an over-90 grade on PageSpeed Insights.

My last error comes with bootstrap, Google detects the file bootstrap.min.css as a render blocker. The file is located in my server.

I've looked for some information online but I haven't found anything. How do I fix this?

1 Answer 1


Here is an article that describes a process for getting a perfect 100 score on PageSpeed Insights using bootstrap: https://www.appneta.com/blog/bootstrap-pagespeed/

They enabled mod_pagespeed Apache module with these settings:

ModPageSpeed on
ModPagespeedRewriteLevel CoreFilters
ModPagespeedEnableFilters prioritize_critical_css
ModPagespeedEnableFilters defer_javascript
ModPagespeedEnableFilters sprite_images
ModPagespeedEnableFilters convert_png_to_jpeg,convert_jpeg_to_webp
ModPagespeedEnableFilters collapse_whitespace,remove_comments

prioritize_critical_css is what appears to solve the render blocking CSS.

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