Spikes in Data

I have a script that hits our endpoint / web server once per user, then waits 10 minutes and then agains hits the endpoint once per user. When I run the same script but change the url to a public webpage (google or Facebook, etc) it will return throughout the time frame. I’m ramping up users, but I don’t think that has anything to do with what I’m seeing. Basically the request and response graphs look like two spikes with nothing happening in between when hitting my webpage.

Has anyone else had issues of a private webpage returning data in this way?

Could you provide a reproducer?