Finally found what’s was wrong : I have a process running in background, pulling messages from a GCP PubSub and processing it with some db queries (the ones that were really slow). And it seems that without any incoming traffic from the outside (GCP PubSub pull requests obviously aren’t), the container goes in some kind of sleep mode after a few seconds.
To overcome this, you just need to update your container’s configuration CPU allocation and pricing to CPU is always allocated so the container never goes in “sleep mode” and is always awake to query database without any delay. This was more like a GCP issue than a Elixir one but still, it might be useful for some other ppl.
Thanks for your help.
