Images not recognised for "Compress Images"

Support
1

Hi,

we just switched our hosting service provider a few days ago and I was now testing our site again. I noticed that most often (but not always), the “Compress Images” score is missing (i.e. “N/A”), though the page does have a number of images and they are delivered by the Apache webserver with the correct content-type: image/*

You can see an example here: http://www.webpagetest.org/result/130909_RS_6FE/

What could be the reason for this behaviour - and is this a problem only for the score in webpagetest.org or would that somehow affect real-world users?

Thanks for any ideas, suggestions.

2

WebPagetest only looks at JPEGs right now (for lossy optimization) and doesn’t do anything for png’s or gif’s which is why you are seeing it not detect your static images.

3

That makes sense!

If this behaviour stays for longer, maybe the Glossary for Compress Images could be updated. It currently reads:

What is checked GIF - All pass PNG - Must be 8 bit or lower (no 24-bit PNGs will pass) JPEG - Within 10% of a photoshop quality 50 will pass, up to 50% larger will warn and anything larger than that will fail. The overall score is the percentage of image bytes that can be saved by re-compressing the images.

Anyway: Many thanks for the quick explanation!!!

4

Thanks, just went and fixed the glossary.