Performance issues with combobox for too many IdPs

Enabling the interfederation metadata (aconet-interfed.xml) instead of just the Austrian services (aconet-registered.xml) gives us about 5500 IdPs. This slows the combobox to a crawl for autocomplete and sometimes even just for opening the dropdown list.

We need to investigate what's taking so long (filtering?), and how to fix this.

This alternative combobox implementation works fine for 5500 identity providers, though it has some minor issues (styling, etc.): https://github.com/garyzhu/jquery.ui.combobox

Note: the minLength: 2 seems to be relevant here - setting it to 0 slows the combobox down to a crawl again. I think this is a reasonable setting though.

mentioned in merge request !4 (merged)

closed with merge request !4 (merged)