If you don’t have any clue which web platform and framework to use, and performance is essential, have a look at TechEmpower Web Framework Benchmarks.
Introduction from the site:
This is a performance comparison of many web application frameworks executing fundamental tasks such as JSON serialization, database access, and server-side template composition. Each framework is operating in a realistic production configuration. Results are captured on Amazon EC2 and on physical hardware. The project is still evolving, and as it does so, the GitHub repository for the project is turning into a showcase of sorts for each framework's best-practices.
And some info about the motivation:
Choosing a web application framework involves evaluation of many factors. While comparatively easy to measure, performance is frequently given little consideration. We hope to help change that. Application performance can be directly mapped to hosting dollars, and for companies both large and small, hosting costs can be a pain point. Weak performance can also cause premature and costly scale pain, user experience degradation, and penalties levied by search engines.
What if building an application on one framework meant that at the very best your hardware is suitable for one tenth as much load as it would be had you chosen a different framework? The differences aren't always that extreme, but in some cases, they might be. Especially with several modern high-performance frameworks offering respectable developer efficiency, it's worth knowing what you're getting into.
View the latest results here:
Remark: What I found really remarkable is how higher level languages and frameworks like ASP.NET and JAVA outperform smaller frameworks like Ruby or PHP. Just another reason why I like being a .NET developer…