Container Optimized System performance

Hello, I am doing some load tests and according to my observations seems the cos-stable machine underperforms a normal linux machine.

I have started up the cos-stable machine with a container running node-alpine linux with a js application and execute a load test, then I did the same using an ubuntu machine, installing the node on it to run the same js application.

Both OS’ were using the same resources, n1 machines with 2vcpu, 8Gram and 10G SSD disk.

Does anyone have information about how to tune the cos-stable container to have the same performance as I had in the ubuntu machine?

Thanks.