Prevent resaving all entries in a multi-site env. if no relevant content changed

[jan-dh]

I'm working in a multi-site env. with 8 sites within a site group. Most entries are set up with the propagation method of : "Let each entry choose what site it should be saved to". Why? Well, very simple. We want to able from a content perspective to "link" these entries.

1. For website visitors reasons: when you change the language/country on a page you want to be on that same page in the new language/country, not start back from the homepage
2. For SEO reasons: og:locale:alternate helps Google etc. to identify the page in other languages.
   Content wise however, they share nothing:

• The slug is different per site
• The content is different per site

Luckily in Craft CMS you can configure this all just fine from a field perspective so you can manage that all on a per site base.
However...
Since no content is shared between the different sites, the only thing they share is

• position
• id

There's no good reason to resave the entry in all 8 different sites on all resaves. This makes the CMS very sluggish and slow, it's not a pleasant user experience. Not only that but it can actively be an issue; 2 people editing the same entry in another language are constantly bothered by the saves of the other person.

On top of that, it flags all related entries in Blitz with an expiry date, meaning that we can't really condense urls for Cloudfront for example.

Would it be an option to only do the resave in all other sites if

• the position changes
• a field that's actually set to non-translatable is changed