deepstream.io (in difference to Meteor) isn't a full framework. The server can easily connect to a wide range of databases, caches or messaging systems. Similarly the client library can be used with React, Angular, Knockout or whatever else your heart desires.
wolframhempel|10 years ago
In terms of speed, please find performance test results here http://www.deepstream.io/info/performance-overview.html as well as a test harness that allows you to replicate them.