Disable V-sync unless it provides functionality to ENB (dunno why it ever would but I don't know ENB), or you'll get extra input lag from old frames being thrown in late when they miss a v-sync cycle. The only time this matters less is when you have a high refresh monitor and stable fps near/above your refresh rate without FPS limiters. That's just a recommendation but it may provide a lot more stability.
Despite what the STEP wiki says, I am pretty sure these values are very wrong. The STEP wiki states that each shadow setting is used for a specific purpose individually, where in my testing and the way these settings normally work in 3D rendering they work in tandem and cannot/should not be heavily warped. Ideally they shouldn't be weird values, and these are at weird values. I'll be making a separate post on this soon.
If these are config settings that ENB depends on for functionality, you can ignore it for now. I highly recommend you tweak them for testing's sake though.
Try leaving BiasScale at 0.15 and continue with other settings. Try reducing your iBlurDeferredShadows setting in [Display] to 1 instead of 3 as you have it currently. But you should be able to tweak Blur without it affecting any of your other shadow settings in a negative way. I find its intensity is dependant on resolution though so maybe it has a significant impact on performance when you begin rendering further shadows.
I believe this is why you are lagging/having stuttering issues. Reduce this to realistic/recommended levels, in the .8 to 1.2 range. The Ultra setting for this is 1.5 and you do not have an Ultra level CPU for Skyrim (read my other post). At the very least, lower it to 1.2-1.5 and increase incrementally if you notice better performance.
Basically, you are rendering what is labeled as "distant objects/terrain" by your config with that setting. But this increases CPU load I think, as it's producing full meshes and textures for objects further and further away from you as you increase your Split multiplier. In short, you'd have to have a huge, high resolution screen with the eyes of a hawk for this to be necessary, and even then you probably wouldn't have a PC capable of utilizing it properly in Skyrim.
And reducing it in my game is actually a boon in performance, just like my testing with shadows. But in my case I am CPU-bound (similar to you but worse); my graphics card has far more room to fill than my CPU and I hit my CPU's limits much earlier than my GPU can in Skyrim. It is not an entirely GPU-bound setting as far as I've been able to tell. Read my first post a bit up from here for more info on how Skyrim handles CPU power.
Besides the above, with the rest of your config settings this particular line should not need to be tweaked to an extreme value of 4.000. That is an insane number for any PC in existence.
I actually only made an account to report these 2 findings, fSplitDistanceMulti= tweaking and the relation between the 3 primary shadow config settings (Bias, Distance and Resolution). Kind of a funny coincidence, but I still haven't had others test it to prove that I'm right. If I'm wrong and this doesn't help, I apologize in advance. But I am pretty sure it will.
Like 99.997% disinfectant-sure.
Edited by Yakuza, 06 November 2015 - 04:03 PM.