.NET Performance

https://docs.microsoft.com/en-us/dotnet/framework/performance/

Performance Tips .NET

https://docs.microsoft.com/en-us/dotnet/framework/performance/performance-tips

running 3.5 on 4.x .net framework

https://docs.microsoft.com/en-us/dotnet/framework/migration-guide/how-to-configure-an-app-to-support-net-framework-4-or-4-5

ms visual studio profiling

https://visualstudiomagazine.com/articles/2015/07/01/11-code-profiling-and-performance-tools.aspx?m=1

Asynchronous programming. Cooperative multitasking

https://luminousmen.com/post/asynchronous-programming-cooperative-multitasking