Changes to make

property noPartialBackingStoreCopies        false       #turn off "special" low-impact scrolling mode.
property useSecondStage                     true        # Default, overridden below in most cases.
property texBindMaxFree                     32          # To stop thrashing, plus a little pad.
property dirtyRectMergeFrames               1           # Default, for low-end card.
property TextureBits                        32           # mostly just for preview -- everything else should be DXT

# ADD THIS LINE
property usevertexbuffers false                        # turn on buttery smooth scrolling