google cloud endpoints /_ah/api/discovery/v1/apis/myapi/v1/rpc takes half a minute to load

[robert king via StackOverflow]

Very often, https://myversion-dot-my-module-dot-my-app-id.appspot.com/_ah/api/discovery/v1/apis/archivedash/v1/rpc?fields=methods%2F*%2Fid&pp=0 can take half a minute to load.

This is killing the load time of my app.

Searching the logs under that version & module with path:/_ah/api.* gives not results - so I can't see what's slowing it down. Also the warmup requests usually take less than a few seconds so it's not that?

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