The scenario that made life difficult for me was First Clash. I get decent framerates in Galloping Horse Downfall, perhaps around 25-28. Again I'd recommend anyone try out Nvidia Profile Inspector. With it I reached kind of an okay status quo; at least a better impression of smoothness, by using it to increase pre-rendered frames to 8 and just using Reshade for FXAA and some other (really pretty) effects (I have ALL AA hard-disabled and only use the shader injector).
In any case, no engine calculations are even being made in WEGO between turns, right? I play strictly WEGO and the framerate is just as bad or worse during the orders phase VS the replay phase, (when, I mean, the calculations are simply being shown after having been made, dig?). Considering the computation time of an entire minute of action is negligible even in WEGO, I'm not gonna sit here and blame my processor. This is a bad, old, poorly optimized 3-D engine on an otherwise stunningly brilliant sim.