The company introduces new Performance Pro 75 Mbps and Blast! DENVER--(BUSINESS WIRE)--Comcast today announced it is increasing Internet speeds with the introduction of a new Performance Pro speed tier of 75 Mbps and Blast! Pro speed tier of 150 Mbps. Customers who subscribe to many popular XFINITY bundles will now receive either Performance Pro, increasing their download speeds from 50 Mbps to 75 Mbps, or Blast! Pro, increasing their speeds from 105 Mbps to 150 Mbps, an increase of nearly 50 percent.