I've tried adding the following to CMakeLists.txt on line 24.

set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)

On my linux build I get about 33 percent reduction in time for a benchmark I've been using (12sec vs 18). The frame rate while dragging is also perceptibly smoother.

I'm not sure if this is supported on all platforms or where the ideal place to put it is, so I'd like to hear from either a CMAKE guru or enough discussion to make a determination about it. We also don't want the added build time for debug builds.

Thanks!