It's been a few years since I played Minecraft seriously, but when I did they were mostly chasing low hanging fruit rather than working on hard or boring problems like modding, anti-cheat, RAM consumption, renderer efficiency or server administration.

Full disclosure: A year of dealing with a small-population server regularly getting OOM-killed on a 512MB VPS might have made me slightly bitter.

Actually, the past 2 years of Minecraft development were almost completely spent on RAM consumption, renderer efficiency, recreating the renderer with an OpenGL 2.1 shading pipeline, switching from direct drawing to VBO's, creating compatibility with translucent objects, etc.

Since January 2013 they've spent almost the whole time on optimizing the performance.

And the only features they've implemented since where features people wanted really badly or features which came automatically – for example, after adding support for translucent objects they were able to add stained glass with just some few lines of code.

Good to hear that things have improved, better late than never.