While the progress seems not up to the speed, the approach itself sounds pretty nice. You can make improvements module-by-module, from the bottom to the top. Wi

While the progress seems not up to the speed, the approach itself sounds pretty nice. You can make improvements module-by-module, from the bottom to the top. With this approach, it's very easy to set priorities using conventional profilers. No large deviation from usual daily operations. On the other hand, this won't be very attracting for small projects, where the biggest bottlenecks are in 3rd party frameworks and libraries. Not being 100% compatible with upstream Ruby (from what I heard), this compiler might not be able to save your day.