Issue Wiki
Performance Issues
Slow sites lose visitors. The cat checks for bloated DOM, missing optimizations, and render-blocking resources.
Slow sites lose visitors. The cat checks for bloated DOM, missing optimizations, and render-blocking resources.
- Excessive DOM SizeYour page has more nested divs than a set of Russian nesting dolls. Here's why that kills performance and how to flatten things out.
- Heavy Inline StylesWriting the dress code on every single wedding invitation individually? That's what inline styles do to your page. Here's a better way.
- Large JavaScript BundlePacking your entire wardrobe for a weekend trip? That's what an oversized JS bundle does to your page load time.
- Missing Image DimensionsLoading a moving truck without knowing how big the furniture is? That's what happens when images lack width and height attributes.
- Missing Lazy LoadingDownloading every episode of a show before watching episode 1? That's your page loading all images at once. Lazy load them instead.
- Render-Blocking ResourcesWaiting for the entire buffet to be set up before anyone can eat? That's what render-blocking scripts and styles do to your page.
- Table-Based LayoutBuilding a house out of LEGO — impressive but fragile. HTML tables for layout are a relic that hurts performance and accessibility.
- Unoptimized ImagesShipping a letter in a moving box? That's what serving a 4MB PNG does when a 50KB WebP would look identical. Optimize your images.
Missing Meta Description
No title tag or meta description means search engines have to guess what your page is about. Like opening a shop but forgetting to put up the sign.
Excessive DOM Size
Your page has more nested divs than a set of Russian nesting dolls. Here's why that kills performance and how to flatten things out.