**System Information**
Windows 7 x64, gtx 580, 8-12gb ram.
**Blender Version**
Broken: Blender 2.69 5edf6fc
**Short description of error**
When rendering large images (20000 x 10000) huge amounts of ram is initially used, then drops down significantly (dropped from 8gb to 4gb for me)... The spike makes it hard to render really large images as going anything larger will result in peak memory usage and what not.
It is also present in border rendering.
**Exact steps for others to reproduce the error**
Open attached blend file
render
watch ram usage spike dramatically, then drop down significantly