11 minutes ago, UrgentSiesta said:

FWIW, I did the same flight in MSFS v2024 with the highly optimized brand new PMDG 738. While the fps was literally double, with scenery density much higher, there was constant stutter in both video and audio until I passed Heathrow (default airport). 

TBH, the XP+Zibo+TrueEarth combo, while much slower and a bit chuggy, was relatively much smoother and more usable. 👍

Hi,

I can confirm that this fix is real nice on my setup, but XP12 is still very, very hard on systems!!! I run one monitor to one computer, no 3D flight deck and I still get flickers every now and again. I can run the other sim with pmdg with SEVEN monitors and experience the same flickers every once and a while. Seven monitors in 2024 to XP12's one monitor.

1 hour ago, Mike_CFII_MEL said:

What I really like about the edit during bad weather is the taxi out/in, makes moving the aircraft in inclement weather that much closer to real life. During flight the rain still needs some work. But no more star wars warp speed rain! Rain doesn't fly into you, it just falls and may get blow around a bit, but it doesn't fly into your aircraft as depicted in Xplane.

But I must say that for me the rain-effects during taxiing always looked really great in Xp12-default.

1 hour ago, Mike_CFII_MEL said:

Hi,

I can confirm that this fix is real nice on my setup, but XP12 is still very, very hard on systems!!! I run one monitor to one computer, no 3D flight deck and I still get flickers every now and again. I can run the other sim with pmdg with SEVEN monitors and experience the same flickers every once in a while. Seven monitors in 2024 to XP12's one monitor.

Yep - performance for XP has been lagging other sims for awhile now. 

the advancements in visual fidelity, etc. have been worth it, IMHO.

Just glad to see that a genuine jump in performance is actually in our hands now. 😁👍

3 hours ago, Mike_CFII_MEL said:

I think my rain looks closer to real than what is given in XP12.

 

 

 

Neither of those videos show thunderstorm penetration - look at the weather radar picture on the displays. They show typical monsoonal patterns widespread precipitation (green) with occasional denser areas yellow and the odd denser area (red). The bottom video is typical equitorial weather lots of cloud and rain and reduced vis but it is at least 5 km even I can see the ground and area outlines. You can get a red blob from an isolated cumulus cloud and fly straight through it without any significant effects. A thunderstorm or severe precipitation will be red and purple. Challenging flying above but Thunderstorm flight nope! Nice clickbait! As for rain effects will depend on the windscreen slope, size overall shape and then the speed of the aircraft. Been there and done that for years and years rule 1 no CB penetration - good way to die! Rule 2 avoid and strap in hard for that sort of weather - the crew in this aircraft are very loosely strapped!

I would agree that rain effects in XP can be overdone and sometimes weird - but to replicate precip in the sim very very hard. No cloud formation gives you the same outcome for precipitation one of the mysteries of meteorology. Been in cloud for hours without hardly a bead on windscreen and then other times the Star Wars effect! 

Edited December 20, 2025Dec 20 by coastaldriver
spelling more information

XP Javelin who does the SGES program (a very good addon and free) just posted on the Org that he has been testing 12.4 and regards it as unstable and encountering strange coding issues - and is reverting back to 12.3. Seems he is not the only one grappling with some strange behaviour. My hunch it is the multithreading - there is a mismatch happening when the CPU delivers to the peripherals and GPU only has to be a millisecond but it is enough. 

3 hours ago, Franz007 said:

But I must say that for me the rain-effects during taxiing always looked really great in Xp12-default.

Not if one is using external views for their visuals. If you run a 3D flight deck no problem, but go external view and your nice rain is gone.

12.4 continues to be a mystery. Trying to chase down why a modified XP11 era aeroplane now developed strange power plant behaviour or props control run amok, I reinstalled it as its original XP11 version into 12.4 fired up the sim and got the menu to show me the XP11 models and loaded it. The original XP11 version now works perfectly in XP12.4 all of it, menus, switches manipulators engine control flight behaviour whereas before it was a bust and half of it would not work due to scripting problems (SASL) etc. Going to try a couple of others that were in my museum Hangar (you know the ones that you hope and wish would be updated but never were) now see what happens. As they say go figure!

On 12/19/2025 at 6:18 PM, mSparks said:

Hmmm, this issue should have been fixed a while ago as far as I know, are you sure it still exists? Do you have the xpd number for it?

The way they've described this c check, now is absolutely the time to make sure all such persistent stupid glitches that are still around are reported and addressed.

Haven’t tried the latest beta yet, but it was certainly there with 12.3.  I previously filed a bug report but do not have a record of getting an xpd number back.

9 hours ago, coastaldriver said:

My hunch it is the multithreading

I mentioned on other forum multi threading going to be a long B run, some people actually think its easy,but as stated before, other sim gad to remove some to im,prove its performance and they have a far bigger team. Some of the ATC changes are doing strange things to

For me, this patch is a radical game changer. I had a significant bottleneck with the CPU, and this, together with auto view distance, allows me to fly in what I consider to be optimal conditions with what I find to be impressive graphics quality (Orbx TE UK + here maps zl17 on the Iberian Peninsula).

Very impressed here and no problems at all….. I only fly the Challenger 650 in XP12 and I’m now able to fly it in VR and it’s a lot smoother than before… very pleased!

8 hours ago, coastaldriver said:

12.4 continues to be a mystery. Trying to chase down why a modified XP11 era aeroplane now developed strange power plant behaviour or props control run amok, I reinstalled it as its original XP11 version into 12.4 fired up the sim and got the menu to show me the XP11 models and loaded it. The original XP11 version now works perfectly in XP12.4 all of it, menus, switches manipulators engine control flight behaviour whereas before it was a bust and half of it would not work due to scripting problems (SASL) etc. Going to try a couple of others that were in my museum Hangar (you know the ones that you hope and wish would be updated but never were) now see what happens. As they say go figure!

Just guessing, but maybe when you enable "show Xp11 models" it switched to some alternative SASL compliance mode for older SASL versions?

2 hours ago, mjrhealth said:

I mentioned on other forum multi threading going to be a long B run, some people actually think its easy,but as stated before, other sim gad to remove some to im,prove its performance and they have a far bigger team. Some of the ATC changes are doing strange things to

The changes I noted simply arose with a check flight with 12.4 to see how it coped (An old amphibian the Hydroz Catalina) as I could do land and water ops etc with the one sim model. I had run a couple of other XP12 models before that and noted some minor freezes with view changes on loading but otherwise nothing bad very good FPS increases. So i loaded the XP12 modified Hydroz and it all worked seemingly until I tried to get it to taxy on land (same thing happened on water) it would not move unless you employed full power then it struggled. So usual thing remove all the plugins (including SGES) recalibrate controls, check keyboard and joystick allocations etc etc. Nothing fixed it. So into Planemaker to check out whether it was something there, could find nothing out of the ordinary excepting Planemaker was now misbehaving as well it had decided this was a single engine 4 cylinder model with at least 8 skid points for an undercarriage went back and forth with that for hours changing it as best I could. I then thought well the original was a bust in XP12 for various reasons which led to the XP12 mods or upgrades. Installed the old original XP11 version and as described above loaded and ran it as an XP11 model - it worked perfectly all of it. That really had me stumped now how could an XP11 model now work perfectly in 12.4 when since the beginning it was a dud! That I still have no answer for somebody may have a better idea. It was in the process that I noted the Planemaker was doing strange things with the way it worked and coded up for XP as well - so my view is that Planemaker is very unstable and I will not use if for the time being. As for the other mystery - as I said go figure. But I still think the other stuff is related to multithreading. I have read what they said about it but remain sure this is going to be very beta for quite awhile but they are on the right track. Time will tell after all what is the point in having a high end multi-core CPU if that capability is not being used?

Anyway. Just in case others get excited NO other XP11 models are still a bust in XP12 as for the Hydroz - no idea why! 

JComm could be the SASL thing not sure how they would have implemented that anyway. If I want to use the Hydroz I just changed to older XP11 stuff and off I go rest of the sim works fine then. Alas it did not fix a couple of others I have been waiting nearly two years for a promised update to XP12 on they still remain a bust.

Edited December 21, 2025Dec 21 by coastaldriver

19 hours ago, coastaldriver said:

XP Javelin who does the SGES program (a very good addon and free) just posted on the Org that he has been testing 12.4 and regards it as unstable and encountering strange coding issues - and is reverting back to 12.3. Seems he is not the only one grappling with some strange behaviour. My hunch it is the multithreading - there is a mismatch happening when the CPU delivers to the peripherals and GPU only has to be a millisecond but it is enough. 

Yeah, but he's the odd one out. I run the exact suite of third party stuff that I do in 12.3 and do mnot see any strangess other than an occasional CTD on shutdown (potentially caused by LiveTraffic).

EGCC loading with A LOT of errors for me.  ORBX TE no longer rendering.  Check scenery_packs.ini and check xToolbox and xOrganizer … reporting conflicts that didn’t exist before?

Live weather doesn’t seem to be working and/or conflict with ASXP.

Nose wheel steering back to being extremely sensitive … settings seem to have disappeared?

Correction to my earlier post, my 182 was Carenado (for XP11)  not default.

Checking out my DA62 (aerobask), King Air 350, and C172 (airfoillabs).

Something is up with the night lighting also, far more reflective than it should be or used to be … living in a world of chrome.  

I have Reshade but not using it since it doesn’t officially support XP12.

Edited December 21, 2025Dec 21 by SayAgain