Joomla site extremely slow

[jarrod1937]

I second New Relic. I just got it installed, currently on a pair of new servers (in between a migration), and it's pointed out quite a few things that I never knew before. For example, I found each and every product in a category was pulling over tax information via a complex query... yet the products didn't even use the tax info. I also discovered performance issues that database caching was hiding from me, because you can view the min and max response time for web transactions. Basically you can see what .php files are performing the slowest, and breakdown that component further into individual queries. Along with this it has your basic slow query and error logs, and scalability reports.
Though, the real question is what to do with the information given. Hopefully you have a web developer that can take the information and fix the issue(s).