Hi Frederick,
I'm still trying to improve loading times and especially the TTFB.
I managed to add update the memcache location by updating the 'master.php' (/wp-content/w3tc-config/master.php). This improved loading times a lot.
I'm now monitoring if all caching goes well. If you have any futher tips please let me know. The only thin I'm seing now is when I add a product to the cart and later try to remove this from the header cart by clicking on 'verwijderen' (Dutch for remove). Visually this doesn't seem to work.
Thanks and regards,
Jeroen