Fog, dust and smoke particles are hitting performance hard. I've seen this happen before in skyrim but it was fixed, now it's back.

There seems to be too much sampling coverage going on in the alpha of these particles. Some of them are controlled by the 'iMaxDesired=' function in Fallout4Prefs.ini and turning it off has some effect on dust but most of the interior fog is hand placed as a static object like in skyrim and can only be removed by the fallout 4 creation kit.

These pictures illustrate the fps difference, the text in my osd is blurry maybe because of gsync? idk.

Inside with lots of fog @36fps:

http://oi67.tinypic.com/2zdoxon.jpg

Outside with lots going on @60fps:

http://oi64.tinypic.com/sol1lt.jpg

I've tested occulsion too and it works pretty well so it's not that at fault here. Any input from anyone familiar with this stuff would be great!

I have an identical problem. Outside is fine, I get good speed and good quality but I go indoors and look at that lighting or fog and the FPS just tanks. I'd gladly get rid of that setting or disable that lighting if someone could point it out to me.

I'm not running on the best hardware though. SLI GT 750m, 16gb, Core i7. I knew I'd be low to medium and I'm okay with that but it still really svcks.

I have the same issue and it is making the game very difficult to enjoy. When i am outdoor with every graphic options maxed out, i get 60 FPS and i never get any kind of frame drop, but as soon as i get inside a building or anything that requires a loading it becomes extremely sluggish and laggy.

I tried lowering the graphical options to the minimal and it doest change anything.

Only issue I'm having is indoors movement stutter when moving side to side. Very noticeable.

In smallish spaces mostly..

Hey! Just wanted to report that I seemed to have resolved it...I do still drop some frames but it's not nearly the slideshow it was and I've even found myself upping the settings.

First, I heard that there may have been an issue with the day one patch. So I was advised to verify the integrity of the cache (on Steam). Back up your ini's just in case.

After I verified, the game had to redownload some files that were corrupted. After that, I checked my .inis and noticed that in the fallout4pref.ini in the steamapps>fallout4>fallout4 folder still had the ipresentinterval=1 instead of =0, so I changed that.

Afterwards, I fired it up and noticed minimal difference between outside and inside FPS, even when looking directly into the fog/indoor lights.

Might have just been me, but can't hurt to give it a shot.

Hey thanks ! I will try that when i get home.