carsonb/PSCollectionView — pull request #5 by carsonb (2012-08-28 17:59:15+00:00)
Title: Feature/performance improvements

Fixes a number of performance bottlenecks, check the individual commits for descriptions.

The next largest slowdown is the NSDictionary which is used to connect a grid index to the CGRect that's been precomputed--there may be ways around this by using an array initially prefilled using the null pattern.