Very slow yet intermittent loading of Google URL when logging in [live site]

[kmdvs]

When logging in, a Google URL is sometimes v e r y s l o o o o w w w . . . Here 41s...

The console even makes that warning
Google Maps JavaScript API has been loaded directly without loading=async. This can result in suboptimal performance. For best-practice loading patterns please see https://goo.gle/js-api-loading
There's also that one (maybe a reason why it is slow?)
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://maps.googleapis.com/maps/api/mapsjs/gen_204?csp_test=true. (Reason: CORS request did not succeed). Status code: (null).