Too large image files: Improve loading time and UX
Unoptimized images slow down loading times and core web hospitals.
Unoptimized images slow down loading times and core-web-vitals performance errors should be prioritized according to affected templates and user view. Not every technical warning is equally business critical.
Check image weight, output size and subject together
A photo with a width of 4,000 pixels is usually unnecessarily large for a 360 pixel wide preview tile. However, file size alone does not explain the problem: a detailed product photo needs more data than a simple illustration if it is the same visible size.
Example: Recognizing the Result
Illustrative example: A product tile with 360 CSS pixels width loads the 4,000 pixels wide original. What matters is the variant loaded in the network protocol, not the file name in the CMS.
Limit cause and implement correction
Targeted limitation of the cause
For an affected image, write down the actual loaded URL, file size, natural resolution, and visible size. On a mobile screen, check whether srcset and sizes select an appropriate variant. A small thumbnail whose link points to the large original is not an error as long as the browser only loads the preview.
Change and follow-up audit
Create variants for the required output widths and compare suitable formats with visible quality. Especially check text in graphics, transparent edges and product details. The largest image file is interesting first if it loads early in the visible area or receives many views.
In the network protocol, control the selected variant on mobile and desktop devices. Then compare the visible quality and the loading time. A new filename or version prevents caches from still delivering the old original.
What makes you recognize a suitable correction
For multiple screen widths, check the selected image URL, file size and sharpness. On high-resolution displays, higher natural resolution may make sense.
Classification and boundaries
When is this indication not a clear error?
A detailed view with Zoom may require larger files than a preview list. Balancing quality and transmission effort against actual use.
Too large image files after CMS and cause
Many audit messages can be resolved faster if they are grouped by system, page type and technical cause. CMS indentations are only linked where too large image files have a clear cause or fixed route in the respective system.
Frequent causes of this error
Related SEO Errors
Appropriate Seitenreport checks
This error should not be checked in isolation. The following tools and clusters help to narrow down the cause faster and to cleanly prioritize the affected URL groups.