Pacer frame -vs- Mixte frame

[Catrin]

Over the winter, once I move in November, I may consider moving the components from Stella (Trek 7.6 FX) to a new frame and selling the 7.6 frame if possible. One assumes this would be less expensive than just selling the Trek and getting a new bike. If I can resist upgrading everything at the same time

So I am starting the "what if" game. I love Surly, but I also like the looks of Mixte frames - and Soma has a nice one that Knotted drew my attention to not long ago.

I already have the LHT, which is a wonderful all-day-long multi-purpose bike but he isn't the fastest, though he doesn't do too badly in this department. If I do this I want to stick with steel, but it would be nice to have a bike that would go-faster, at least a little I hate that aluminum buzz that seems to go throughout my body so aluminum is not an option.

If all else was equal, would the Pacer or Soma Mixte be somewhat faster than my LHT? Opinions? Obviously both have a rather different geometry from my LHT.