SEMrush often flags issues with JavaScript and CSS files, specifically when they are unminified, uncompressed, or uncached. These files control your website’s design and functionality, and if not optimized, they can slow down your site.
What These Issues Mean
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Unminified: Extra spaces and formatting make files larger than necessary
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Uncompressed: Files aren’t reduced in size before being sent to users
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Uncached: Browsers can’t store files, so they reload them repeatedly
All of these issues impact website speed, which affects both user experience and SEO rankings.
When You Can’t Fix It
If your site is on platforms like Squarespace, you usually can’t edit these files, and that’s okay—those platforms often handle optimization behind the scenes.
Also, if the files come from external sources (like plugins, Google Fonts, or third-party tools), you won’t be able to fix them.
How to Fix It (WordPress)
If the issues come from your own website:
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Avoid manual fixes unless you’re experienced
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Use optimization plugins (like Autoptimize)
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Or choose better hosting that handles this automatically
Hosting providers like SiteGround can optimize these issues with simple settings, making them the easiest solution.
