Most of Cloud Service Providers including Softlayer are providing Vyatta 5400 in their VPC offering.
Brocade has new generation of Vyatta called Vyatta 5600. Brocade claims that this new generation Vyatta will be able to go past 100 Million Packets Per Second on standard COTS hardware.
This big performance improvement is achieved by architecture change of Vyatta OS.
Vyatta 5400 Architecture
Vyatta 5600 Architecture
Please refer the YouTube video below for more explanation.