This post describes changes on the Public Test Realm.
Invaders AI logic is moved from runners to processors to optimize server load (engine#48617ce).
Some more optimizations of native PathFinder (driver#34 by laverdet).
POSSIBLY BREAKING CHANGE: optimized RoomPosition internal representation from an object with two numbers and a string to a 32-bit number (engine#87 by laverdet).
These changes are deployed to npm in version
3.3.0-beta.1 with tag
npm install screeps@ptr