Here are a few links that I have found helpful to get a great overview of optimizing graphics and code in Unity. There are so many great tips in these that you can’t really take them in all at once and I often go back to them when I am dealing with performance issues.
Best practices from the Unity manual:
Tutorials from the Unity learn site:
- Optimizing Graphics in Unity
- Optimizing Unity UI
- Diagnosing Performance Problems
- Fixing Performance Problems
When I have time I want to add a Unity Tips page to the blog and start putting these kinds of links in it. There are also some good general links in the sidebar.