Hello @hlorenz
Sorry for the confusion but we got what you are mentioning.
Calculating the scores is not required for the plugin to function properly. The scoring system is only for the internal use.
As suggested earlier, here’s the workflow we recommend to websites that are big like yours:
1. Import all the data from your other SEO plugin:
https://rankmath.com/kb/yoast-seo-migration/
2. Connect your website to Rank Math’s Analytics module
https://rankmath.com/kb/analytics/
and once the data populates, then choose the top performing posts.
Open such posts and since the focus keyword(s) would be already imported, the initial scores would be calculated as soon as you open the posts. Now, you can optimize your top performing posts by checking the recommendations suggested by the RM plugin and get the final scores for your posts.
Otherwise, you can open Google Analytics and start by optimizing the top performing posts and then way your work up the ladder.
Importing scores from other plugins would not be a good idea at all since they are not a ranking factor and the tests offered by the Rank Math plugin are updated according to Google’s standards and our internal findings (which works great).
Hope that clears the situation and provides a possible solution.
Please let us know if there’s anything more that we can help you with. Thank you.