Some of our existing ServiceNow outbound REST calls were being made through a Flow Designer action, using an imported RestMessage with OAuth authorization (typical OAuth Application Registry and OAuth Profiles). This was initially set up since our /oauth/token endpoints were internal and not on the internet and hence had to go through a MID server to access the token endpoint and the REST step in Flow Designer supports that.

Ignoring the above reasons, since this was being triggered by a UI Action button, from a user experience perspective, there was a noticeable delay in calling and running the Flow Designer action. I decided to investigate, from a raw performance perspective, how much faster it would be to use a script instead of a Flow Designer action with a typical REST step…