Making ActiveRecord 2x faster
It's good to see members of the Rails core team taking performance seriously. I've been on a personal performance quest for the last couple of years, and what I've discovered is that the Rails community as a whole (not necessarily the core developers, but just people producing Rails-related software as a whole) really seems to consider performance to be something of an afterthought. There is a lot of low-hanging fruit laying around that could substantially improve quality of life for the entire Rails ecosystem if people would put a little time into profiling their stuff and eliminating hotspots.It's been very discouraging to me to see responses to performance issues that range from lukewarm to plain "I don't care". The Rails community could benefit a lot from a visible push by the core team to make performance a priority.