[Bf-committers] Making blender faster

[Tom Musgrove]

Also,

you can avoid commiting the memory for most of the time, and likely 
completely avoid having all of the image in memory at once.

Basically on loading you load part of the image, project it to a lower 
resolution version, then get rid of that chunk, and repeat the process.  
This could give a bit longer load times, also when zooming in you are going 
to need to load in certain chunks to recompute.  Of course you'll load as 
much into memory as you can (but it will all be prechunked on disk so that 
instead of swapping you just dump the least likely to be used chunk and grab 
it from disk when you need it again...).

LetterRip