Some time back I did a load of work on performance diagnostic work on some poorly performing Sitecore websites. (Which was the basis of a talk I gave a few times) I've recently had to look at some similar issues - but the world has moved on. I now have Visual Studio 2022 as my diagnostic tool of choice, and the websites are commonly hosted in Azure PaaS web apps. So what do you have to do these days to diagnose likely places for your code to be stuck?
I find myself doing quite a lot of work on performance for Sitecore websites at the moment. Whenever I do a similar job for a group of clients, I start to spot patterns in the sites I'm working on – and it struck me that there are some common performance issues that can be spotted just from the overview graphs you see when you collect trace data.
So to try and help you all improve the sites you ship, here are three that I've come across in a few projects recently:
I got the chance to speak at the Manchester Sitecore user group recently, introducing some tools and tricks that can be used to measure site performance while you're developing your Sitecore code. For anyone who wasn't there (and those who were but, want to refer back to what I said) here's a summary of the important bits of content from that talk...