Here is the link to the discussion of it.. http://www.simforums.com/forums/forum_post...=19466&PN=2This is the link to the patch..its version 1.3 for UT USA. http://www.simforums.com/forums/forum_posts.asp?TID=19685They mention OOMs a lot for this bug, but I never got OOMs but did get a lot of stutters which was fixed by this. You mentioned you fly out side of the US too so I'm not sure if this will help you.Also, what is your monitor refresh rate at the resolution you run FS at?

Thanks again for the input folks.Cutting the sound with 'Q' doesn't change anything: if only it were that simple! (Though it wouldn't be simple, would it: a choice between having either sound or stuttering!). I don't really have a 'usual area' for flying - I go all over the world. The stuttering can occur anywhere, and also at FS9 default airports, with no addon scenery installed..Red, do you have any links for this 'well known' UT bug? I don't get any change when I reduce traffic to 0%, but that might not be the solution, if it is a UT thing. If you have any more information, that would be useful - I'll do a search anyway: not aware of a recent FS9 patch, but maybe I haven't looked properly! (nothing shows on the UT site/downloads.. which patch are you referring to? I have my fps set to unlimited at the moment - as per advice here. Too early to say if it has helped, although recent flights have been OK (it is an intermittent problem, as I originally said). I always had frame rates limited to 30fps - and got enough stuttering to start this post.Bill, as I stated it's a laptop - Dell XPS M1730. It's a high end machine, designed for games, and 75% of the time runs FS9 as smoothly as anyone could wish - certainly better than any PC I own/have owned. Basic stats are given as a signature at the bottom of all my posts..I don't have any process called seticon installed on my FS machine - in fact, the laptop is purely for FS9 & FSX, so there's no email, messenger, even anti-virus (well there is, but it's always fully disabled when I am flying - I never go online on this machine) etc. etc. etc. Plus, with my own script, I kill off all superfluous processes before I start FS(I consider myself pretty knowledgeable PC-wise (A+ cert etc.), so am certain I am not killing off anything vital).It's at least consoling (slightly) that others have exactly the same problem as me - although from the number of posts on this stuttering, even on AVSIM, that was never in doubt of course! :-)Martin

Sorry I didn't read the fine print at the bottom. Have you tried completely uninstalling and reinstalling your video\audio drivers? Then before starting FS9, delete the fs9 cfg and let fs9 rebulid new one will default settings. Goto default AP, KSEA. Do you still have the stuttering??Bill M

This is primarily to solve the fps drop that I always experienced when opening up the ATC window, as that brought out the cursor. You can imagine how frusterating it was to be on short final, and having to open up the ATC window to confirm or report something, and having fps drop from 40 to 20 for a good 5-6 seconds.

Red, why don't you just simply use keystrokes instead of the mouse to open the ATC window and to communicate with ATC?IMO, that's much quicker and solves your stuttering problem in this situation.Since I experience the same "mouse stuttering" I have assigned as many commands as possible to the keyboard, to my yoke and to my throttle quadrant.Wolfgang

Hi again. I'm grateful for the continued suggestions..I have wireless etc. but have all that disabled as I never use it. I know the sound side of this machine is a problem, as I always get a tiny pause (very, very short) when ATC begins to announce something, but whatever settings I use, either in FS or for hardware acceleration etc. make no difference to this. But I don't think that the 'velcro effect' is anything to do with that, or else why would I get pretty smooth taxiing etc. for more than half the time? It's odd to me that I can go to an airport and have appalling frame rates and dreadful stutters, reboot and find (some of the time) that all is OK. Nothing at all shows up on File Monitor. I think I have been mixing up, when reading "UT", Ultimate Terrain and Ultimate Traffic! I have both, and thought the patch mentioned was for Ultimate Traffic - but I see it's for Ultimate Terrain. I'll check the links, but I think I have all patches for Ultimate Terrain installed already, and as you say, since I have UTerrain USA disabled when I fly outside the USA, this probably isn't the cause of the stuttering.Screen refresh rate is 60Hz - there's no other option available.Bill, I haven't tried reinstalling the audio drivers, (I'll check that there is nothing newer first), but I will give it a go. I still don't think audio is the problem, but I'll try anything!. I did, as mentioned above, replace my tweaked fs9.cfg file with the default one (I keep an out-of-the-box setup of FS9 on another PC - very useful for testing purposes, and I can just copy any default files over to my proper FS9 machine). It had no effect on the stuttering.Martin

.. just to confirm, my UT USA is already latest version with all patches..M.

Try a good registry tool, I use Desktop Maestro every day, you would be surprised the amount of unwanted junk slowing your computer, there are lots of programs out there which will clean it up, worth a try.

Thanks, but I do that regularly, with Registry Mechanic. (Last time just yesterday). M. :-)

Did you try "Game Booster"? Google for it, and it will close all programs that work in background. Well, not all of them, but those that system do not need to work with.

Hi again. I'm grateful for the continued suggestions..Bill, I haven't tried reinstalling the audio drivers, (I'll check that there is nothing newer first), but I will give it a go. I still don't think audio is the problem, but I'll try anything!. I did, as mentioned above, replace my tweaked fs9.cfg file with the default one (I keep an out-of-the-box setup of FS9 on another PC - very useful for testing purposes, and I can just copy any default files over to my proper FS9 machine). It had no effect on the stuttering.Martin

I understand you keep a FS9 cfg on backup. But I want you to let FS to rebuild a new FS9 cfg after you do a driver reinstall. I think your experiencing an audio problem. The only way to be sure is to start isolating and starting fresh. I fly into heavily congested areas with my sliders maxed out. I don't experience any delays in ATC or stuttering. FS9 is a very CPU demanding. If your audio also require the cpu to process it's sound (which is set up to operate by default). you'll sometimes get the sutters. I elinimated my stuttering and delay issues years ago by installing a seperate sound card that processes the sound itself without relying on the CPU.Bill M

Red, why don't you just simply use keystrokes instead of the mouse to open the ATC window and to communicate with ATC?Wolfgang

I do use the keys on my joystick to operate the ATC window. But when you open the ATC window, it brings up the mouse cursor...as in its visible again (without moving it).Also, just a warning...do not try any programs like 'game booster' unless you really know what you're looking at. Many of those programs will simply ruin your system and don't 'boost' anyhting.All i can say at this point is retry to reinstall everything (windows, fs, drivers). I've had this problem on and off through about 7 on my current system. Somehow, the last time i reinstalled, no stutters only if I limit fps to 30 or 60. :(

OK, I'll back up my fs9.cfg file and then let FS rebuild one. Let you know what happens. Thanks,M.

I'm afraid the new fs9.cfg didn't stop the stuttering (I just had a couple of days when it was OK, but it's back today - I can't help wondering whether it's starting flights at some of the 'heavy' payware airports I have installed that kicks this off. I'd have to investigate that further).Martin

Update: also disabled the sound (SigmaTel) and used a small USB soundcard instead. I still got bad stuttering - five seconds smooth taxi, then 5 seconds juddering. It drives me nuts! (And yet for two days everything was OK again - that's how it goes). Looks like I am just going to have to put up with it, but something must be happening during those repeated 5 seconds of stutterM.

Hello,I know .. you had certainly already read it thousand times .. but stutters ar originated in 99,99 % from a program(s) or a windows service(s) running in background.Those are too much for quote them all ... like programs autoupdates .. antiviruses realtime scanners .. antimalwares .. etc ..All who can acces hard disk files can produce more or less stutters.Nevertheless .. maybe in your case the cause is in the 00,01 % ?Regards.Gus.

Martin, how many processes do you have running when you start fs9?