Edit: Oops. I think I posted in a wrong forum :\
Driver: vsync off, AA application controlled, AF user defined/off.
Game: TAA, vsync off, fps cap off, DoF off, (everything except decals is off in BethINI), god rays medium.
ENB: default Cathedralist's ENB, AO Enabled, AFx16, vsync off, fps cap X
Attempts to change vsync:
application defined, Game on, ENB on: (30-60 bad stuttering)
application defined, Game off, ENB on: (30-60 bad stuttering)
drivers off, Game off, ENB off, ENB cap 40. (30-60 less stuttering but overall still bad)
drivers off, Game off, ENB off, ENB cap 60. (30-60 less stuttering, playable?)
drivers off, Game off, ENB off, cap off. (same result as above)
drivers off, Game off, ENB off, cap off, clamp 60
drivers off, Game off, ENB off, cap off, clamp 30
(OK performance, 1 CTD
@ coc whiterun)
drivers off, Game off, ENB off, cap 60, clamp 30 (substantial improvement in FPS stability and stutter)
drivers off, Game off, ENB off, cap 60, clamp 60
(substantial improvement in FPS stability and stutter, 1 ctd
@ coc whiterun)
drivers vsync off, Game vsync off, ENB vsync off, cap 60, clamp 50 (best and playable result so far)
Drops FPS. ENB fix improved it, but still not at 60 fps.
So far CTDs
around whiterun with 2 CTDs
@ clamp 60 and 1 @ clamp 55. One CTD
on game load at clamp 60.
Present, rare. Impact unclear.
Some of the fixes I added. Most notably:
uInterior Cell Buffer=12
uExterior Cell Buffer=108
Added fixes and settings:
[ENGINE] (no visible performance impact)
All settings (not sure if I need all of them but just in case, slight overall improvements)
Moving AFx16 to ENB seams to have positive impact.
Impact of disabling all effects of ENB during testing in laggy areas is marginal at best (virtualy no change). Removing ENB completely caps everything at 60 FPS. FPS never goes below 30 (29.9). Whenever game switches from 60 to 30 there is very annoying, pretty bad stutter. Except when vysync is off completely and FPS is caped at 60 or "uncapped". A lot of stutter is resolved by iFPSClamp=50.
1) Vsync sucks.
2) iFPSClamp is by far the most performance degrading/improving setting due to stuttering.
3) I have no idea what is actually causing lag spikes.
An example of consistent massive drop due to minor camera angle adjustment. It alwasy happens in that exact place:
Some test cases. Sometimes inconsistent performance and results:
Looking to the west of the first stone (lake) gets me 60 FPS. Looking to the east (waterfalls, Riverwood, water mill) results in 30 FPS. Waterfall in particular seams to be the cultrip. Road between stone and Riverwood fluctuates between 30 and 60 (has other values) so is coc whterun area. Clamp 50 improves situation. Game becomes very much playable at 30 fps with noticeable stuttering such some areas.
Ocasional texture flicker. Impact on FPS is unclear. Temple across river from stone in Riverwood has one of the stairs textures flickering. Drops FPS to 30. Rare fence flickers seam to have no(?) impact.
Solitude produces no noticeable lag except for blacksmith on the sharpening wheel.
Honningbrew Meadery was a constant source of lag. Increasing clamp to 50 solves the problem. Changing it to 0 while game is running makes it come back very quickly but not at first. Need to walk around.