ECS game servers are lagging. Where should I be looking for the issue?

I am running my Unity (2021.3.1f1) servers on ECS using Fargate. When I test the game, I run a single task with 1vCPU and 2GB of memory and I connect 2 clients to the server. The server tends to lag about every 3 seconds, making the game far less enjoyable. I have enabled Container Insights and I found that the CPU and memory usage was nowhere near the 50% mark and the task's network usage seemed fine to me as well. I am now wondering if this issue could be related to the AWS services I use and the way I have set them up or if I should be looking for the issue inside my network code.