Ruby is fast. I don't mean that it's "not slow," I mean that the
language itself and its users move quickly. When major frameworks and influential Rubyists declare that a new version should be supported and an old one deprecated, many, many people follow. The switch from Ruby 1.8.7 to 1.9.2/3 left behind some valuable tools that Rubyists relied on to introspect on running processes. Memprof, REE, and other profiling technologies aren't 1.9.2 compatible. JRuby can leverage the JVM's tools, and Rubinius has some ideas floating, but as a community, we're flying blind.