Somewhere around Magento 1.5, message from the title of this post begun to pop on every product save.
We actually forgot to do this with one of our sites – but when developing, we obviously had cache fully disabled. When you go to launch, there are so many other things you are thinking about that it is easy to forget to enable all the cache again.
So, as a reminder to all of you that have launched Magento sites, turn back on the cache if you haven’t yet! It will definitely speed up the performance of the site.
One of the most important enhancements you can make to your Magento installation is to properly configure your MySQL database server.
A proper MySQL configuration requires a low level understanding of your underlying hardware and, primarily, the memory (RAM) available.
There is one specific MySQL configuration parameter above all others that will produce significant performance improvements and takes very little understanding to implement.