I am running an i7 2700k @ 5 ghz, 8 gb 1833 mhz ram and a GTX 570, and I still get some lag in GFFA. Hence I'm relatively sure that everyone no matter the power of the computer experiences lag on GFFA. Granted it was way worse in 1.1 but it still gets rather laggy in 1.2 as well.
So what I did to fix this was modify the Galaxy Far Far Away XML file, basically removing almost all pirate presence from planets (the few I left I diminished the fleet and garrison greatly) and giving all planets to the Rebel Alliance and Empire. I gave the Empire more planets (including all core planets, and most mid-rim planets), but the Alliance has more starting money and starts at Tech 2 (this way the rebels get the T-47 that it can't get at tech 0/1) to balance it out a little bit. Rebel and Empire heroes that were recruitable only on "hard to reach" planets were moved to planets that usually get conquered or are owned by respective factions, some more logical for the hero than others (eg. Carlist Riekan on Hoth). Then I removed most starting fighters/transports that rebels/empire cannot recruit to remove the lag from too much unit variety. Now I'm week 60 into the campaign as the Rebel Alliance, and so far it has been a lot of fun with minimal lag and a real war from week 1 instead of a laggy pirate grind. The campaign has better performance than most similar size campaigns in other mods, yet it has the feel of greatness that is PR.
I'll probably continue to modify the XML file, as I was lazy and just wanted to try this out first to see how it plays out. A lot of planets just have soldiers, a space station and in some cases a golan or two to mark the faction the planet belongs to at start of the campaign.
What I'm wondering though, is if it was possible to do something similar for 1.3? Basically, a GFFA campaign with minimal pirate presence and the galaxy split in both factions. It might not be the most canon campaign, but I think it would be enjoyed by a lot of players. As it is the modified GFFA campaign performs so well that I'm sure even more planets could be included without too much of a hit in performance, although I'll find that out if I continue modifying the GFFA XML. I could also upload the XML file once I'm satisified with my modifications on it if anyone else wants to try it out.
edit:
Released version:
Edited by Chih, 05 March 2013 - 03:55 PM.