Do you even know what scalability means? It roughly means that when the demand on your software increases linearly, you can throw more hardware at it (also at a linear rate) and everything should be fine. It does not mean or imply using a small amount of resources. In this sense, using SSL is pretty scalable since it's always a fixed cost per connection and as your number of connections increases linearly, you don't need to add computers exponentially fast.
> Encrypted traffic cannot be evaluated or scanned or routed based on content by any upstream device. IDS and IPS and even so-called “deep packet inspection” devices upstream of the server cannot perform their tasks upon the traffic because it is encrypted.
Good, that means it's doing its job right.