Performance problem on

We recently launched and are experiencing some serious performance issues:

What we already did or are currently working on:

– Installed and configured W3 Total Cache

– Database Cahcing using memcahced

– Combine and optimized .js

– Minifiy .js and CSS

– CSS optimization (working on)

– Server optimazation (on-going)

What worries us:

– Time to first byte

– Number of request

– Should we use CDN

Looking for any ideas what we should prioritize optimizing or if any of the plug-ins we are using are know to have performance issues.

Any suggestions and opinions are welcome

Torben Grue