In #1560, we discussed the reasons that core libraries like CKEditor should be bundled with core, and not be dependent on an external CDN. That keeps our sites from depending on many different systems to be available and accessible to function properly.
As stated by @quicksketch in #462:
Shared CDN library loading is a bit of a double-edged sword.
However, since there could be some major performance gains from using CDNs to host libraries, it seems reasonable for us to be able to support that functionality as a core feature. It could be as simple as a checkbox on the Performance config page saying "Use CDNs to deliver libraries when available", or something more complicated which lets a site owner select both the source and version for each library.
Recent comments
When there are thousands of links to be listed, it is better to split the map. Otherwise, hreflang is a good choice.
xmlsitemap module generates wrong links for languages
I don't fully understand why someone would need multiple sitemaps for different languages, but you certainly know better. Good luck!
xmlsitemap module generates wrong links for languages
Easy xml sitemap doesnt seem to offer multiple sitemaps for different languages, otherwise it seems a good solution for a single sitemap but then it doesnt make sense to exclude languages at all...
xmlsitemap module generates wrong links for languages