

My employer uses Akamai as a CDN (and security) provider for their websites. Akamai has an optional tool called Image and Video Manager that, in a nutshell, optimizes images for better site performance.
Basically you put a high quality image on your website, and when Akamai retrieves it the first time it optimizes its color palette, compression, size, and format for multiple devices. Each derivative image is cached by Akamai for 30 days at a minimum.
So while you may put a 1000x1000 JPG with a quality of 95%, an Android user may be served a 200x200 image with 80% quality, and it may be a WEBP or PNG format instead of JPG. Exactly which derivative image is served is based on criteria like the web browser being used, the viewport size, etc.














My grandparents had a summer home on a river that I don’t a lot of summers at when growing up, until I was about 20 or so. (I’m now knocking on the door of 60). The place was sold in my mid 20’s when my grandparents both passed away. I check it out on Google from time to time, and I’ve seen moderate changes over the years, but it still looks mostly the same. I’m a bit sentimental about it since I spent so many fun summers there.
Not true of their next door neighbors. The neighbors house no longer exists. It was apparently completely torn down and replaced. The biggest giveaway from the perspective of Google is that there is now a swimming pool between the house and the river that wasn’t there a few years ago, and the driveway is a completely new layout as well.