Wow. I just ran across this for the first time today.

Can anyone confirm what this option is really intended for, and if it is actually useful?

I started a post on this a while ago...what it does is distribute the load differently across your cores. If you use this option, then watch a cpu monitor on your computer that looks at different cores, in general (and I do mean general) I found that instead of heavy loading 2 cores and somewhat loading the other 2, it maxed one and distributed the rest more evenly. To what benefit? It seems to handle sudden cpu load spikes a bit better. But it doesn't instantly buy you overall fps...it simply takes better care of the sudden fps drops.

That helps, thanks.

I also read similar reports report about hit-or-miss type behavior, which cautioned me to think that maybe this would merely provide a placebo effect like "bUseHardDriveCache=1".

Based on your findings, do you feel that there's any reason to not use this option on a regular basis?

I've had it on since I found out about it...I ran some benchmarks and after many of them I found that the fps average increase was very small, and that was attributed to slighter higher 'minimums'. So, it can't hurt. The only reason I can think of NOT to use it is if you for some reason are doing something else cpu intensive while playing skyrim and are now directing certain programs towards certain cores. I make videos, so at first I thought NOT using it would be good...I could direct FRAPS at 2 cores while concentrating skyrim on other 2 (not exclusively, but mainly). But when I found that there was no measureable performance increase to doing it this way, it seemed more of a hassle. So I turned fullproc back on.

I have not retested it on/off since 1.4 beta though...it isn't impossible that this would make a difference.

Umm guys this command line config originated from Battlefield: Bad Company 2 BETA as a debug command that forced 4+ Core usage but caused instability for most users (Game crashes), it does nothing that I know in Skyrim and it's not referenced in any of the EXE's. nor does it process the command at run time.

So I don't know why it have any difference in this, hmm.

EDIT: I'll test this to see if it actually works.

EDIT 2: Just tested, no change in FPS or CPU usage, maybe Alex knows something about this?

In your test, I you would have to look at individual core usage.

Okays here's my tests:

FullProc Option Off:
http://i42.tinypic.com/2hda4yd.jpg

FullProc Option On:
http://i42.tinypic.com/kaogow.jpg

I see a sod all change, sorry but this option seems highly obscure for Skyrim lol.

(It's only ever been known for BC2, nothing else.)

Hmmmm.... the placebo is strong with this one....

Googling this turns up an average amount of hits, usually with the same explanation: "add this and you will see improvements". Too bad Bethesda couldn't weigh in and settle this.

Beyond this undetermined parameter, are there any other known and established command line settings?