I'm the author of ASP.NET Core 1.0 High Performance, a book about creating fast, scalable, and high performance web applications with C# and ASP.NET Core 1.0 (the new open source and cross-platform framework from Microsoft).

Although many of the examples focus on ASP.NET, it is also a big collection of general tips and experience applicable to making web apps perform well with any language or framework. It covers images, compression, architecture, networks, cloud hosting and even a bit of team culture.

ASP.NET Core 1.0 High Performance

If you would like to know more:

I'm also available for hire