Realistically almost every web app can start as a one-tier web app that uses SQLite as a data store and serves mostly HTML.
In almost all performance areas -- gaming, PCs, autos, etc -- there are usually whole publications dedicated to performing benchmarks and publishing those results.
Are there any publications or sites which implement a few basic applications against various new-this-season "full stacks" or whatnot, and document performance numbers and limit-thresholds on different hardware?
Likewise, there must be stress-test frameworks out there. Are there stress-test and scalability-test third-party services?