New Amazon WorkSpaces Bundles https://aws.amazon.com/about-aws/whats-new/2025/01/larger-general-purpose-bundles-workspaces-personal-core/

we still don't know what are the instance family behind right?

technically, you can pull that up using the metadata, but the idea is that we manage the instance family to guarantee capacity

So we can still get a t3 or whatever. And in that case, we tested with t3, performances are really really bad. :(

Don't worry about that, all t3 instances are being migrated off to more current hardware