As expected, twas the Cache

Not much to say or show, just that the performance problem was due to the textures being larger than the texture cache.

Under 10% CPU usage, much better

As it is now, on my Mac mini the game runs at under 8% CPU usage in the menus and Zen, and under 10% in Drop. The largest texture is 1024×1024, DXT5 compressed (4:1, or 1 MB). Before it was 1024×1024 uncompressed 32bit RGBA (1:1, or 4 MB). That either means the GMA 950 in these older Mac’s has 1 MB of cache, or perhaps 2 MB (I didn’t check with 16bit RGBA textures, but it’s unlikely).