We have migrated one of our EC2 instance from T2 to T3 and found there is a lack of performance on the server and when we had a call with AWS support they shared that the T3 type is based on the nitro hardware and it required drivers to support a nitro based hardware.

Downloaded and updated the network (ENA) and Storage (NVMe) along with the PV drivers on that instance.

https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/migrating-latest-types.html#upgrade-pv