boredzo/gist:1363410

## gistfile1.txt
New CPU Usage cache

Currently: Parallel C arrays of Cocoa text system objects, colors, etc.
	drawRect: looks up the objects it needs in those arrays, indexed by the CPU usage percentage, and creates and caches whatever it doesn't already have.
Problem: drawRect: has a slow path where the cache does not contain the needed objects yet, so it must create them. Even the check itself slows down every pass through drawRect:.

Solution: A single array containing blocks.
Initially, this would be filled with all the same block, each of which creates the needed objects, creates a block that captures those objects and does the drawing, and replaces itself in the cache with the new block.
drawRect: simply calls the appropriate block in the array, unconditionally. The slow-path block will move itself out of the way when it's no longer needed.
	New CPU Usage cache

	Currently: Parallel C arrays of Cocoa text system objects, colors, etc.
	drawRect: looks up the objects it needs in those arrays, indexed by the CPU usage percentage, and creates and caches whatever it doesn't already have.
	Problem: drawRect: has a slow path where the cache does not contain the needed objects yet, so it must create them. Even the check itself slows down every pass through drawRect:.

	Solution: A single array containing blocks.
	Initially, this would be filled with all the same block, each of which creates the needed objects, creates a block that captures those objects and does the drawing, and replaces itself in the cache with the new block.
	drawRect: simply calls the appropriate block in the array, unconditionally. The slow-path block will move itself out of the way when it's no longer needed.