Kubernetes pod is maxing out at 1 CPU

I have a GKE Kubernetes cluster and a deployment.

I set the resources stanza on the deployment to

resources.requests.memory: 4G
resources.requests.cpu: 2
resources.limits.memory: 4G

cpu limit is unset

I deploy the pod (a Django web app) and hammer it with a load test. When saturated, the pod CPU usage goes up to 1CPU — but essentially refuses to go above 1CPU

Any ideas what I should be troubleshooting here?