So...maybe this has been discovered before, but I'll share it anyway in case it hasn't. I've been messing around with SSAO/SSIL, and I've discovered that you can reduce the precision and quality settings from -1 (Extreme) to 2 (Low) and gain a massive boost to performance, while only incurring a small hit to visual quality. I've been able to go back to playing the game at 2560x1600 (full screen for me) at 40-50fps pretty much everywhere, using 140% SSAO scaling (for some reason, if I try 150% or more at 1600p, the game no longer seems to be able to render the vast majority of polygons in the world, and I get this scattering of lights and a few effects like blowing snow and waterfalls, but no land, no characters, etc. I suspect it is simply an available memory thing...I'll have to tweak around with enblocal.ini memory settings and see if I can resolve the problem.)
Here is a comparison...a four fold difference in performance, for an imperceptible difference in IQ (there IS a difference, its rather subtle, but you have to overlay the two halves of this image on top of each other and swap back and forth to see it...without swapping, during gameplay, you generally wouldn't notice the difference, and SSAO still looks pretty good (and DAMN good when you downsample!)):
Upper half: Maximum quality, precision, 140% scaling @ 10-11fps
Lower half: Minimum quality & precision, 140% scaling @ 42-45fps
Anyway, dunno if anyone has discovered this before. I know that reducing SSAO scaling has been the primary means of gaining a performance boost so far, but I highly recommend trying a lower quality and precision setting. It seems that precision has a lesser impact on IQ than quality. Personally, I get over 30fps frame rates if I use 1 (Medium) for quality and 2 (Low) for precision, and it looks just ever so slightly better. For those who are performance concious, I suggest dropping it to 2 (Low) for both, then try jacking SSAO scaling back up. Those of you at 12% scaling or around there could probably jump right back up to 1.0, and still have improved performance (I was able to go from around 35fps at 1920x1080 at 60% scaling to 42-45fps at 2560x1600 at 140% scaling...MASSIVE, MASSIVE difference in performance...and the game looks a hell of a lot better. I can even jack up my AA settings, get MUCH better edges, keep DOF on at all times, and the game still runs faster with ENB than it ever has before...and I'm not constantly wanting to push quality anymore. The nice thing about this is, you can jack SSAO scaling up, keep the quality low for gameplay, then turn the quality and precision back up for screenarchery, WITHOUT having to exit the game!
)
Anyway, if this was all previously known, sorry for rambling.
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I have mine set to 0.774596669241483, which is 60% scaling. I don't really like anything below that. I used to run at 0.894427190999915, or 80% scaling (and when I did, I usually got about 15-20fps 
, hence the reason I pulled back to 60%), and I prefer to run it at 1.224744871391589 (150% scaling) for screenarchery (which, ironically, also seems to run at about 15-20fps...)
