It is, but it might work for your app, too – js/css/image caching at CF nodes helps a lot. Moreover, you can disable their cache/cdn features and use it only for SSL.

They even have multiple modes, the "Flexible" one works even with no changes at your server at all. It obviously makes the CF<->server transfer insecure, but your users would still get a "green lock", if that's what you're after.

This is from their in-settings help: https://www.cloudflare.com/a/static/images/ssl/ssl.png