Oh, good point. The test was done in the current stable 5.5 release in a development configuration :) Since this is a change to the memory layout of the class, there should be no change due to the build configuration, though.

I haven't profiled this specifically, but my guess is that there shouldn't be any measurable performance gains. Most of the time, actors are randomly scattered in memory anyway, so having smaller actors doesn't avoid a lot of cache misses.

Oh, nice to see that there are real-life examples of this stuff, thank you very much :) Needless to say that I'll take a deeper look at the overlaps now :D