Sign in to follow this  
BabtridgeMcJoystick

X-Plane occasional hitching

Recommended Posts

Hi

 

I appreciate this may be a very common question, but whenever searching for a solution to this kind of thing, the choice of words becomes very confusing and leads to going round in circles!

 

I am a beginner. I have Steam X-Plane installed on an SSD (Samsung 850 Pro), and am seeing what I would call hitching, but others might call it stuttering, momentary lag etc.

 

Basically the sim is nice and smooth all the time, however I am seeing momentary, quarter second lockups similar to what I used to see in sims when I ran off a mechanical drive when it was loading scenery. I had hoped that 16GB RAM and an SSD would prevent this? I don't have any scenery packs loaded and apart from some carenado planes I added, the sim is stock.

 

I understand there is a difference between frame rate and smoothness of running? I have all settings at max, and am seeing good frame rates (above 25 for Carenado Cessna Centurion and 75+ for a freeware Tupolev I found on here) so I am assuming turning some stuff down will help, however I would like to know exactly whats causing it and why. Any ideas?

 

My setup is:

 

5820K (4.0GHz)

GTX980 superclocked (not running the second one for X-Plane as it hates SLI)

Corsair Dominator 16GB RAM 2666MHz

Samsung 850 Pro 512GB SSD

Cooling is provided by a Corsair H105 AIO.

Share this post


Link to post
Share on other sites
Help AVSIM continue to serve you!
Please donate today!

Does this occur when using default aircraft without any plugins?

 

Eg:

The C172.

The Cirrus Jet.

The C400.

Share this post


Link to post
Share on other sites

I see the same thing. I thought getting the 5820 might eliminate it and was most disappointed when it didn't. I'm glad I saw your post though to find out that a chunkier graphics card wouldn't help either before I shelled out.

Share this post


Link to post
Share on other sites

I just built a new system - super fast, similar to the OP's machine - and I get the same thing.  I'm running the HD mesh v2, SkyMaxx Pro at high settings, and UrbanMaxx.  During normal flight over dense scenery (near London Heathrow for example), my CPU/GPU percentages are around 22% with frames smooth as glass in the 40's to 50's most of the time.  I have XP-10.31 on a very fast Seagate 4TB hybrid drive with 64GB cache feeding a SATA3 6GB connection, and my Win 8.1 OS runs from an SSHD.  Loading times shouldn't be a factor, but they appear to be the cause. 

 

The CPU/GPU are loafing along at 22%, then suddenly they pause for a split second, peak around 50% for an instant as frames resume and immediately return to 22% load.  I don't know if this is due to the heavy SkyMaxx cloud generation load (there were many heavy and scattered clouds at the time), the cloud draw distance setting or the XP scenery draw distance setting, or the altitude and speed (220kts) of my (C47) Mustang 510 jet.  So, yes, it shouldn't happen.  On the other hand, when I'm low and slow on approach (for example), I don't get any split second glitches, so it doesn't impact my approach control.  I'm still setting my system up and tweaking, so I don't know if this is a problem with GA aircraft at low altitudes or not.

 

I've also heard that when you set AAAF high that the video card pulls in the image, upscales it 4X, applies the AAAF, then downsizes it back to original resolution.  If that's the case, it may be that the video card can handle the load OK even at 1920x1200 that I run, and the CPU can handle the load easily, but the pipeline between them may be a bottleneck.  We are running much higher powered hardware than that under which XP was originally coded.

Share this post


Link to post
Share on other sites

Yes this seems to be a common problem (including myself) affecting many system configurations, all is smooth and then fps drops for about 1 or 2 seconds and then all smooth again, even with default planes and scenery.

Share this post


Link to post
Share on other sites

Weather updates is certainly a possibility because it would require a slower internet feed (compared to internal computer data transfer), and it would "reset" the visual features of the sim, including and especially clouds which are resource-hungry.  Might be worth trying a flight w/o active weather connections.  My pauses have never been more than one second, but I haven't flown XP10 much on my new system yet.

Share this post


Link to post
Share on other sites

I too get this problem, and I disabled weather and all plugins to try and solve it months ago. The only thing that solved it was turning off objects all together. So annoying.....

Share this post


Link to post
Share on other sites

Try going back to the nVidia 337 vintage drivers and see what happens. Helped my 770.

 

John

Share this post


Link to post
Share on other sites

Although I don't have framerate problems, it is my understanding from other posts that SkyMaxx is actually better on framerates than the default clouds in XP10.  I wouldn't expect it to cause "hitches" unless the code somehow loads the clouds before generating and displaying them - apparently that is not the case here.

 

I did notice that the last update to 10.31 included some sky bitmaps and possibly some clouds (I'm not bored enough to sit for 20 minutes and watch all the filenames scroll past...).

Share this post


Link to post
Share on other sites

Also, if you have TrackIR, try flying without and see what you get.  I have made some adjustment and it seemed to help.

 

John

Share this post


Link to post
Share on other sites

The "hitches" so far have not been an annoyance to me.  If you really wanted to rule out cloud generation, you could fly under clear skies and see if the problem goes away.  Other than that, I think it's a matter of scenery draw distance and the sheer amount of data that must be loaded at high detail settings.  I could pull my eye candy sliders way back, watch my framerates skyrocket and test that theory as well, I guess.  As I mentioned elsewhere, as you descend on an approach, the scenery and cloud draw distance will decrease (although airport scenery density could offset it), and your speed slows, the computer has more time to pay attention to framerates and has less new scenery to load - presumably it has already been loaded as you come down.  I've never had a "hitch" on an approach flying some fairly complex Carenado aircraft.  Admittedly I have not flown the super-complex big iron in X-Plane yet, but I think it would impact framerates rather than "hitches."

 

With my fast system, framerates are no problem anymore and my CPU/GPU values loaf around 15-22% when flying, so I think it's a loading issue, not a CPU or RAM issue, and I sure don't run out of RAM, either.  I did not install XP on my SSHD but it would be good to hear from anyone who has.  My HDs are super-fast 4TB with 64GB cache on SATA3 6GB/sec cables to the mobo, so only an SSHD could be faster at that point.

 

I hope others will do some experimenting here.  I have out of town guests all week and my play time is limited.  It would be nice to know the source of the "hitches" or is anyone out there who does not have the problem.

Share this post


Link to post
Share on other sites

Another thought comes to mind here.  If you have ANY background program running that periodically "phones home" for data such as an anti-virus scanner, Microsoft Defender, Adobe plug-ins or any vendor that wants to momentarily take over your CPU cycles to inject its own data, you will likely get a "hitch."  Many of these vendors set their update checker to automatic without offering the user the option of doing it manually at the time of installation.

 

Also, as someone noted elsewhere, turn real weather OFF and see if it makes any difference.

Share this post


Link to post
Share on other sites

I've been paying closer attention to the "hitches" in a short flight this morning into Paro (VQPR) in a Carenado Cessna 208B.  The only "hitch" I noticed was during a weather update/upload going from mostly clear skies (few clouds) to much heavier clouds as I approached the mountain ranges.  I will continue to monitor what's happening when flying, but that may also account for the fact that I've never had a "hitch" during an approach perhaps because the weather has already been loaded and displayed earlier.  I am using SkyMaxx Pro with some fairly heavy settings, so I don't know if the "hitch" is the internet connection pause, or a system pause while new weather (already loaded) is prepared for display.

Share this post


Link to post
Share on other sites

Yeah I get that when weather updates. However I periodically get 2 or 3 second pauses for no apparent reason where CPU usage on 12 threads jumps to 100% before going back to normal. I find I also get micro-stuttering at times too. It's not too bad when fps above 30 but I find it to be intensely annoying. I mainly operate VFR over high res photoscenery (Zoom level 18) with W2XP OSM so I'm looking down a lot to marvel at the scenery. The stutters just destroy the effect. It didn't used to be that way.

Share this post


Link to post
Share on other sites

I'm still playing with this, trying to find a reason (if not a solution).  I'm guessing at this point that it has to do with cloud generation settings, which are a huge load on the system.  This would explain why weather updates cause a slight pause, especially if XP is looking for information at the same time the system is polling the 'net for an update.  I don't know exactly how XP handles weather, but in FSX, using ActiveSky (for example) the entire weather for the globe was downloaded during initialization before the program began, so if that is the case for XP, it would take a few moments to update the entire weather database each time the server is accessed.

 

I actually crashed my display drivers yesterday when I made a big change in my SkyMaxx Pro settings while flying, so the current nVidia drivers (344.75 as this is written) may be suspect, although I have had no problems with them otherwise.  The did add a new MFAA (Multi-frame sampled anti-aliasing) mode in the latest edition which may not work quite right with XP or FSX.  I also know that in FSX, that it used to be recommended that you use the settings in FSX, not the nVidia driver settings, although I don't know if that is still valid information.

 

Guests leave today, so I'll do some more testing.

Share this post


Link to post
Share on other sites

I have noticed during testing, the hitching only happens during day hours, at night in the same location with same weather set the FPS are higher, and the hitching does NOT occur! 

Share this post


Link to post
Share on other sites

That would lend further support to the possibility that it is clouds or scenery draw distance that is causing the "hitch."  XP9 used "fog" or "haze" to limit draw distance to help framerates.  In XP10, that is not a factor (unless you have it included in custom weather settings).  At night, clouds are not much of a display factor.

Share this post


Link to post
Share on other sites

I have been searching since I got X-Plane 8 months ago for this exact problem.  My system is almost identical to the OP, 4770k 4.4 ghz, gtx 980 samsung evo ssd etc and its like a hiccup every couple of minutes. None of my other games experience this problem.  I did a clean install this week, and added no plugins and it was still happening.  Now i just have skymaxx pro, pilot view and trackir installed.  I dont think it is the nvidia drivers cause I am constantly swapping out my drivers with betas but have reverted back to the 337 to try to resolve this issue.

 

Its frustrating because I have spent so much time, money and research to get XP10 to run as smooth as possible and its there, with the exception of this.

Share this post


Link to post
Share on other sites

Hi guys

 

EDIT: OK I just did a test with my Centurion, and what I was finding was the hitches are in the same spot every time. I took off from Innsbruck, and the hitch happened when I got to a little bend in the river every time, so It looks like there is something X-Plane is doing when it hits that boundary. It locks for a full second or more with the centurion (complex model), half a second with the C152 (less complex), and about a quarter second with the Cirrus TheJet. Downloadable weather is off. Clouds at 89%, other objects are around medium settings. Most everything else is at or near max, though I am yet to replace my little 1280 x 1080 monitor (yeah I know). Setting NVidia DSR to HD resolutions doesnt seem to impact performance much at all however, if thats any indication.

 

ORIGINAL POST: My apologies for not coming back to the thread sooner, I have been fighting with P3D / FSX to try and get ORBX up and running :D Thats what I get for treating myself to all the sims to see which one I like best lol.

 

Now I think about it, I did have the weather download thing active. I know this because I loaded up somewhere and they had 26 knot crosswinds. My little cessna decided it wanted to roll, and roll, and roll... (is that normal?). I think I turned the weather download off after that but don't recall if it stopped hitching, I will have to test.

 

I have no addons at all except a little Cessna 152 and.. something else. IDK I had a binge in the Carenado sale. No scenery packs or anything at all. I was flying a default Cessna at the time. Oh yeah it was the Cessna Centurion with the glass cockpit is the other one.

 

But yes its odd, lots of very capable hardware yet still the hitching. Its not a show stopper, but when you have splashed out on lots of expensive silicon you feel compelled to sort it!

Share this post


Link to post
Share on other sites

OK I am on a bit of a mission now. I am using the same flight path each time, departing Innsbruck on runway 8, then flying roughly bearing 070 once leaving the runway threshold until I meet a bend in the river.

 

js3OfMk.jpg

 

With object settings at "a lot" you should see two triangles of static carvans (depending on your scenery packs). Its at this point I always get the lock up, sometimes shorter, sometimes longer. Hopefully people can repeat this.

 

I tried the following, repeating twice to make sure of the result. Values were changed independently, not cumulatively:

 

Reducing clouds completely to zero: Still get hitching

Reducing trees to zero: Still get hitching

Reducing Objects to zero: Still get hitching

 

Then I got tired :) Weather download is off, Anti-virus is off. No TrackIR. Most other sliders at max or ON etc. Latest NVidia drivers. Nothing conclusive, but I will try other things.

 

By the by, whilst trying to take screenshots, I met PSYCHO BOEING. The first time I met him, he raced to the end of my runway (yes, my runway lol I was already on it), wafted back and forth with smoke pouring off the tires, then basically did a handbrake turn and hammered it towards me. Result:

 

hPtBPLul.png

 

DKSW1MSl.png

 

kwZxIID.png

 

Scuse the jaggies, its running on a monitor from 1783. NASA were in a massive hurry. I saved it as a situation and twice he decided to ramp himself up the side of the mountain, and the third time he just sat there. So I took off over him :D

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this