Back on the iPhone 3G, PNG decoding alone was slow enough that I had to cache pre-rendered bitmap representations into SQLite blobs to achieve "glassy" scrollin

Back on the iPhone 3G, PNG decoding alone was slow enough that I had to cache pre-rendered bitmap representations into SQLite blobs to achieve "glassy" scrolling of image-heavy grids; I'd do the SQLite loading on a worker thread and dump the pre-rendered bitmap representation right back into a CGImage wrapper. I recall there being some inline NEON assembly involved as well. Within 1-2 years, those optimizations were totally unnecessary.