XPG states that “the current prototype can be paired with a 1TB SSD operating at 985MB / sec. The mouse connects to the computer via USB-C. Considering this is a wired mouse, such performance seems possible. It is likely that the user will actually be able to play the games stored in the Vault.
Which SSD is used there, unfortunately, is unclear. Probably ADATA. XPG plans to bring its mouse to CES 2022 (assuming it’s offline, of course).
How much such a device might cost is not yet clear, because this is only a prototype, not a commercial version.