Well, i think someone said that the Jag and the Falcon were pretty even when it comes to overall power, so i found this page http://membres.lycos.fr/pmandin/en/ports.html
Here you will find pics of Quake on the Falcon, as well as ports of other FPS. Just watch carefully the systems requirements, you need at least 14 megs of ram, ouch. And while the screenshots looks pretty good, i guess we would have to see it on movement.