Application performance deployed on azure container instance

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Azure

I've deployed my python flask application on azure container instance with docker compose. I managed to deploy it successfully but I'm observing the performance of the application is super slow and it's taking 4-5 seconds every api is responding. When I deployed this application on a VM it is working as expected but on ACI, I don't know why it's so slow and how to tune the performance.
Following is my docker compose file for my application

What I have tried:

version: '3'
services:
  api:
    image: xyz.azurecr.io/xyzapi # image from azure container registry
    container_name: xyzapi
    domainname: service 
     
    build:
      context: .
      dockerfile: Dockerfile
    ports:
      - "80:80"
    command: sh start_prod.sh
    # assigning 4 core cpu and 8gb RAM to the container instance
    deploy:
      resources:
        reservations:
          cpus: '4'
          memory: 8G

Any help really appreciated.
Thanks