grid.display.list(on=TRUE)
engine.display.list(on=TRUE)
This display list could get very large so it may be useful to turn it off in some cases; this will of course disable redrawing.
All graphics output is also recorded on the main display list of the R graphics engine (by default). This supports redrawing following a device resize and allows copying between devices.
Turning off this display list means that grid will redraw from its own display list for device resizes and copies. This will be slower than using the graphics engine display list.