Web services with Wix?

I manage 2 diferent sites, one very global (about footpathes and walks in a region), the second more specific (about construction/maintenance of pannels for making walks).

We are currently setting up a full marking of all pathes (based on node-points) and want follow the progress of this installation. WHen a pannel is installed, worker has to report it (through a QR code and a form); this feeds a table in the second specific site.

I would like to show a brief summary of this progress in the globl site by showing for exemple "On Y pannels to be installed, X has been completed, ie N% of the total job"

I did this 'simply' by creating the page in the specific site (having acces to the table containing the detailed information) and inserting an html object in the global site, displaying this page.

This process works, but is very slow (5 to 10 seconds to display the page in the global site)

Is there other more efficient ways to achieve this?

For exemple, create a web service on the specific site that could be programmatically called from the global site, or some other way to query from the table in specific site, directly from the global site?

Thank you for your advices

Claude