In reply to Keith Davis.

Stay with Zen Cache, Keith. I have tried using WP Rocket on three occasions now, with three different sites/themes. To say I was underwhelmed with the complexity of getting it going and their very slow and technically challenged support, would be an understatement.

I think this result only goes to show ~ with so many newbies out there, willing to give them their money and not knowing how good Zen Cache or Smart Cache are ~ almost anyone can earn a few bob with any old product.

My view, of course, and your mileage may vary.