You get dedicated time on a core while your task is running. For instance t3.medium is 2 vCPUs (because hyperthreading) but as you can see in [0] it's only one

You get dedicated time on a core while your task is running. For instance t3.medium is 2 vCPUs (because hyperthreading) but as you can see in [0] it's only one physical core. [0]: https://aws.amazon.com/ec2/physicalcores/ https://aws.amazon.com/ec2/physicalcores/