This happens to me on my laptop and desktop too... it's been going on for a few months I'd say!
To see if there's a difference switch on the timing view (using the [[ SHOWTIMING ]] script command - see below) and look at the load % at the top right. They should be very similar.
OK. Observation: While zoomed in (at 16.0) non-History is faster, but at 2.0 both are running at a similar speed. I'm not talking about much, maybe 3 gps difference at 16.0. It seems like LifeHistory has an advantage based on zoom level, probably to do with the rendering (Life has to calculate a lot more gradients than Life+History)
The performance should be very close for the same pattern at the same zoom. [R]History rendering does use the shading but has to draw extra states. Additionally if state 6 is used then [R]History has a little more work to do when computing the next generation.
In general the rendering speed is slower for zooms < 1x and non-zero angles.