After reading just two of the chapters (on ASP.NET and ADO.NET) I realized this guide is going to be the reference for .NET performance. It leaves very few stones unturned and mentions or references almost every perf tip I know of (and quite a few I did not). Why do jagged arrays perform better than multidimensional arrays? When could an ASPX page get compiled into a single asembly? The guide is super.
I thought of a few ideas while reading through, and since they are soliciting comment I sent some along. I'm interested to see or hear if they have an impact.