Embed: Investigate slow rate_limit requests

[nutrina]

The requests made to the /validate-api-key in the embed service appear to be slow.
Apparently this is because of validating the API key (which takes between 4 - 6 s when testing).
Investigate what the cause for this and fix if possible. Ideally this request would return in less than 1 s.

I have performed the testing by triggering events from the lambda code editor, and using logs (prints) with time stamps to track where the most time is spent.