Let's begin with screenshots of the current version of Spring, taken with Fraps running for FPS:


Now moving on, here's the current SVN build in action:


And, for what it's worth, SupCom in action:


Conclusion: the new version of Spring brings with it a performance increase of between 45% and 26%, depending on the settings you use. Also, if you can currently run Spring with all settings maxed, you can also probably run SupCom at maxed settings as well... at least, until things begin to heat up...