Firstly, my http://47th.info/downloads/DxDiag.txt.

DxDiag Cliffnotes:

i7 920 proc @ 2.67GHz, 12GB RAMM (which DxDiag reports as 8 but third party programs report it correctly, seems to be a Win7 issue), GTX 285, Win7. Latest drivers for everything.

Post Cliffnotes:
FPS were alright before latest patch, now game is completely unplayable.

__________________________________________

When I first purchased FONV things ran relatively smoothly. Not as well as FO3 by any means but alright. I'm a big modder so I naturally ran into the d3d9.dll fix on NVNexus, downloaded it, and went along my merry way.

A few days later I came across a 4GB.exe paging file NVNexus. Sounded good for people with x64 OSs like myself so I downloaded it and used it.

Played for awhile, kind of messed up the storyline, game was crashing frequently, et cetera. I decided to shelve FONV and just go play FO3 on a nice, long playthrough. Take my time with it in the hopes that by the time I finish FONV should be patched up well enough and be stable. Plus more time for good mods and FO3 mod ports.

So, I have about a week left of content in FO3 and I decided to get FONV all primed and ready for a brand new play through. I download the new NV compatible FOMM. Get NVSE installed. Start going through mods and installing them, et cetera.

I get about ~15 or so mods in place and am pretty happy with it for the most part (still waiting for FO3'a "FPS Grenade Hotkey" to get ported!) and I launch the game to get the boring character creation out of the way.

The second I get into Doc's house it's a slideshow. I'm talking less than 5 FPS here. I exit the game and launch NV through vanilla launcher, disabling all of my mods through the Data Files option. Get back in game, same thing.

I exit again. I set GFX quality to low and jump in game. Same thing.

I figure maybe it's just Doc's house. Struggle through the whole creation, get outside, same deal.

Head over to NVNexus to make sure I have the newest version of d3d9.dll, download and reinstall just in case, same deal. I try the alternate d3d9.dll, same deal.

I begin snopping around the web. Found some Fallout3_default.ini tweaks that might help. Specifically something like setting FPSrate=0 to FPSrate=60, do that, now I get [censored] FPS and my character is moving in slow motion.

So I go back into the ini and revert that.

Found some post on yahoo answers that says to disable NPC emotions. Do that, nothing changes.

Go into NVidia control panel and set my NV specific power management to performance, nothing changes.

I think it's worth mentioning at this point that whenever the game would zoom in on a something, like when having discussions with Doc, the FPS stuttering vanished.

So then I remember the 4GB.exe paging file. I try that out and voila, awesome frame rates!

Happy ending, right? Well, not quite. I've lost all NVSE functionality and the game won't let me use the 4GB.exe as FalloutNV.exe (tells me to update to the latest patch, I bought the game on Steam so it's updated).

So then I jump onto the Fallout Online Forum community and [censored] about this. A mod over there has a rig very similar to mine and reports the same issue: game has become unplayable since the latest patch.

I'm not even sure what I'm asking for at this point... the 4GB.exe is the only work around I have come cross to make the game work and run well. But like I said, I've lost the functionality of the Script Extender which means some really good mods no longer work (like Sprint). I want this stuff back as FO3 and FONV are only mediocre, gameplay wise, without mods and I really enjoy customizing my game into a perfect personal experience.

Are there more patches on the way? Do Bethesda and Obsidian even know that their most recent patch has destroyed playability for people with systems similar to mine?

And I'm kinda pissed that I'm already reading DLC announcements when the stupid game runs like crud on my system.

I guess I'm just really, really frustrated that FO3 can run smooth as glass and be completely stable on Ultra GFX quality with ~70 mods while NV can't even be played without the 4GB.exe. I mean, it's the same GFX engine. How could Obsidian possibly screw this up to the degree they have?

Ugh... need... help...

Edit: I just tired the http://www.newvegasnexus.com/downloads/file.php?id=34832, NVSE version, and it has also failed to resolve the issue.

Bump. Useful info in here.

Im in the same boat I made a post a day or two ago and I dont think any help is on the way.
I was pretty upset, I set aside freetime the other night and spent the whole night into the early morning trying to get the game to run.
Im gonna post up some videos on YOUtube. I bet Bethesdas will slap me with copyright violations. Theyve been seeming to do that latley.
I shouldve gotten the console version but imm too spoiled by the enchanced graphics and now im most of the way through the game.
Another thing is it seems like I cant change my ini file, everytime I run the game and go back to check it seems like the game puts it where its going to put it (the settings) and reverts it back so I can't fix it on my own.

If you've updated everything (graphics card drivers 260.99), you dont need the d3d.dll in fact you shouldnt really be using it with these new drivers. Get rid of it and try again.
You need to post your dxdiag here on this thread since the link you posted doesnt seem to be working.

This game is not gonna play so nice with the mods (like Fallout3, or my beloved Oblivion).
It's a Steam game, with automatic updating and file-verification etc...
So - any nice tidy little mod.esp (that you can 'tick' in the launcher) might work.
Ini tweaks, NVSE, or anything that mods the falloutnv.exe? Good luck with that, it's gonna be a nightmare.
I predict Steam is going to make GFWL look like the good old days...
Anyway, dude you're getting ahead of the community here - most people are strugglin' just to get the stock game running. It's early days.
You're trail-blazing, so we're going to ask YOU how things work, LoL, when it's mod time.
But it's not mod time yet,
Regards

How about disabling steam's automatic updates, then right click on Fallout.exe in steamapps, click Properties, then Previous Versions and restore the previous patch (by copying it instead of the current Fallout.exe)

Worked for me.

The link works fine. I just opened it in my browser as well save target as.

Yes your right the link does work. Have you tried removing the d3d.dll?
The game should work fine with the update. Works great on my system, solved the stuttering for me.
I have read threads where people have issues with the d3d.dll and the updated nvidia drivers.
You should also disable mods if you have them and try it then.

Yes, I tried without d3d9.dll. Yes, I tried without any mods of any kind. I tried with the most default and basic of FONV installs (no mods, no d3d9.dll, no extra anything, on low GFX settings). I said all of this in my OP.

I would simply uninstall the game (add/remove programs) and try a fresh reinstall. Try to run the game after steam has patched the game.
If the problem persists, you might try emailing bethesdas tech support with this to see what they have to say.

LOL, I did e-mail Bethesda, actually. They told me everything had been corrected in the latest patch and to update to that patch.

That was the e-mail. After I specifically opened with "Since the 10 NOV 2010 patch..."

Clearly they don't give a [censored]. I'll try a fresh install though and see if it makes any difference.

I have no problems with steam(I have a lot of steam games and no shortage of pop ups and updates) and I am running about 15 mods(using the FOMM). I do notice some performance loss on occasions, mostly this occurs after I load a large interior cell like a vault. When that happens, I save, exit to desktop and reload into the cell and that has always fixed the problem.

To the contrary, I suggest you do as I did and choose in Steam NOT to automatically install any updates.

I'm doing this myself since the 1.2.0 patch broke my VATS. Now I'm playing a good playable game without it going to 0-5 fps in VATS mode, only under the previous patch and not under 1.2.0 :shrug: I had no choice really, this was just the quickest way I could get it to work - I like experimenting with the settings etc, but heck when I want to game I want to game! B)