What are some enbs that are decent in performance?

My personal favorite one is Old World ENB. There's also performance dynamo enb but my antivirus keeps saying there's something sketchy about it. Sadly, when I bought a bigger monitor, I could no longer run it at a stable fps. Even though I'm a console player at heart and am used to 30fps, it is a bit of a bummer that I can't run it smoothly anymore.

I would go with the Enb of the apocalypse

Here are a few:

Overgrowth Performance Version

Old World Enb (as obamatron said)

Melancholy Dust Enb Performance Version

I'm sure there are a ton more but I've used all of these and they were great, I have a 980 so I have used other more intense ENB's as well and these hold up fine against them.

actually FNVRWL is really good on color and really don't need enb as is. it don't have any impact to my game at all with my old amd cpu and hd5870. if you still prefer enb after trying it out. onix performance enb is really good if you can stand the infamous glow dust at night(which a lot of enb suffer as well). hope of eli if you don't mind a little desaturated color. rust enb is what i'm using right now with a simple little tweak on setting and different palaette. the latter two doesn't have the dust glow problem though.

oh, you can always try out the shader enb neutral if you using vanilla weather. it's pretty good without any performance hit at all.

I use Blackout ENB and I still have decent frames. BTW I think Fallout 4's Lighting and sky actually looks like Blackout ENB.

Brave New Wasteland is a good one aswell, running a GTX 660.

my prefer is OLD WORLD ENB