We have some URLs that are being flagged as poor inside Search Console in the Web Core Vitals report. For example, the report is saying that some pages have too many CLS issues.

When looking into things we can do to update we have noticed that when we run the same page using the PageSpeed Insights tool we are not getting the same bad scores. This is making it hard for us to actually know what needs to be addressed. Nor can we tell if a change actually fixed the issue because in PageSpeed Insights there is not an issue.  Has anyone else had similar issues. If so have you found a way to fix it?

Dirk,

Thanks for your quality response! Within webmaster tools we get a decent amount of clicks from image search but still less then 10% of our overall organic traffic. Without being able to filter out that the traffic is coming from an image in GA I am not sure how else I can gauge how much organic traffic we are getting from images. We came up with the solution leaving our current images at their location but moving new images to the subdomain. Because much of our inventory changes with new seasonal lines we are adding lots of new products so those images will all be hosted on the sub-domain.

Thanks,

For sever work- load enhancements we are planning to move our images to a sub-domain. so the files would be located at something like

images.domain.com

Rather than domain.com/images/

We are a large Ecommerce site so we have a lot of images. These will be self hosted so we are not using a CDN. I'm hoping someone has done the same and if there were any steps they had wished they had taken before making the move/ if they noticed any traffic impacts things like that.

Shaqd

I have done this, although I am not familiar with the canonical method you mentioned. Social share counts are tied directly to a URL so if the structure of a URL changes at all the old count will be attributed with the shares. You can create a custom social share button that pulls the data from the old pre  url structure change. Mike King has an awesome post about how to do that here (which is what I believe you are referring to with the og: url propterty?): http://searchenginewatch.com/article/2172926/How-to-Maintain-Social-Shares-After-a-Site-Migration 

You can read a thread where he and I discussed it here: http://moz.com/community/q/preserving-social-shares-through-url-changes

His method works.