Hi. I am a pretty experienced web developer and would like to start offering professional WordPress speed optimization to my clients. In search of tutorials on this topic I came across a “Speed-Op Course” by WPJohnny. He sells it for $600 for the complete set. I could not find any sample videos from the course, so there seems to be no way to preview. I would hate to buy and then ask for a refund.
My question is if anybody tried it and is it worth the price. Any recommendations for other courses are welcome!