fixed CPU runs +20° hotter in idle after update to 2.9.16.10523.

[okopanja]

On 5/23/2025 at 4:13 AM, 318_Bonzo said:

Unfortunately I have the same. I had to uninstall the patch. I play on a laptop and after the patch the fans go crazy even on the start screen and the case heats up like an oven. Oddly enough after starting any mission the load on the processors decreases but is still higher than before the patch. DCS becomes unplayable - my wife is screaming at me to turn off that hair dryer!

Please ED fix this ASAP, my wife is angry as well, and I fear they are not the only ones.

[TheBiggerBass]

I guess the issue is not just plain CPU load. I checked with other higher CPU load (most of the 32 cores >50%) applications and they run as cool as usual without driving the fans to a heart attack. I also wonder why the fans go crazy when DCS is just showing the main menu without any action, just waiting for user input. Makes no sense to me.

Edited May 26 by TheBiggerBass

[Gunfreak]

I tried a complete reinstall, no reason it should work, and it didn't I have 100+ until I hit play, and go into the cockpit then the FPS falls to 6-9 

[Oberst Struppi]

@BIGNEWY

When can we expect a hotfix?

 

 

Edit: I tested again today on the CW Germany Map. Hitting 85 degrees CPU Temp when entering the F4 on the ground. Under .9599 temperature was never going beyond 66 degrees.

I’am cooling the 9800X3D with a NZXT Kraken V2 Elite 360mm.

Our squadrons dedicated server shows the biggest issue here. We are struggling with pretty intense desyncs since .10523. Our main public mission is no longer playable.

Edited May 26 by Oberst Struppi

[Roy35150]

Can we also get a revert on steam?

That way it gives every1 a chance to still enjoy the sim,

and gives the devs a chance to fix whats wrong?

Cmon devs this is bound to happen now and again.

 

[mosshunt]

I will throw my two pence into having the last stable available to revert to on steam, issues are going to happen and that mitigates it somewhat. On the plus side my CPU & AIO have passed stress testing

[silverdevil]

i tried a simple bfm in afghanistan. i have Intel 11th Gen Core i9-11900KF and 3090. the cpu never got above 60 C and gpu never got above 75 C. these numbers are within specs.

i will try to see if a well populated mission changes anything.

[Lange_666]

14 minutes ago, silverdevil said:

i tried a simple bfm in afghanistan. i have Intel 11th Gen Core i9-11900KF and 3090. the cpu never got above 60 C and gpu never got above 75 C. these numbers are within specs.

Within specs of what? Posting a certain ° temp means nothing.
It's the difference in ° between the previous versions and the latest when doing exactly the same mission or just sitting in the main menu.
That's what it's all about, not some single number and then say it's within specs.
Previous CPU 52° in the main menu and latest 74° in the main menu. Both can be regarded as within specs but the difference is huge for the same performance.

Look at it as fuel consumption in a car in neutral before a red light. Before the maintenance, 800rpm and a consumption of 1 L/h of fuel, after maintenance, 1600 rpm running in neutral and a consumption of 2 L of fuel. I guess your next stop will be at the garage again and ask where the difference comes from.
 

[silverdevil]

46 minutes ago, Lange_666 said:

Within specs of what?

of what the system operating temps should be according to the oem. i was just trying to help with my own evidence. no need to act i am stupid. if you were as smart as you think you are, perhaps you should have fixed everyones' problems by now. or at least realized that not every user is having this issue. take care of yourself idling at the red light. 

[Lange_666]

3 minutes ago, silverdevil said:

 or at least realized that not every user is having this issue.

I do realize 200% that not everybody has this problem but don't understand why those who don't have the problem keep coming into this topic where they have nothing to search about in the first place and then trying to convince people there is nothing wrong. And I know I can't fix it otherwise I didn't start this topic or would have posted a solution if I found one but then none of you who don't have the problem didn't bring any help either.

[BIGNEWY]

4 hours ago, Oberst Struppi said:

When can we expect a hotfix?

as soon as we have a fix and its tested. When I can share a patch date I will let you all know. 

thanks 

[A n Y]

24 minutes ago, Lange_666 said:

I do realize 200% that not everybody has this problem but don't understand why those who don't have the problem keep coming into this topic where they have nothing to search about in the first place and then trying to convince people there is nothing wrong. And I know I can't fix it otherwise I didn't start this topic or would have posted a solution if I found one but then none of you who don't have the problem didn't bring any help either.

On 5/24/2025 at 10:25 AM, A n Y said:

For those who don't want to go back to an older version and have a powerful PC and a problem with temperatures. Temporarily lower the turbo boost on the processor in the bios or turn it off. Those who don't go into the bios can achieve a similar result in windows in the power options and reduce the cpu performance % I have 99% and turbo is turned off. Frequency drops from 4.9Ghz to 3.7Ghz temperature 70C to 36C.

That won't help you. For me, 99% is enough to drop DCS temperatures by 30°C. On other games it has little effect in performance.You may have to give 90% a try and let me know if it helped.

 

[db349]

Same problem here,

Launching DCS and arriving on the menu screen, I hear my CPU fans going almost full tilt and staying there even without doing a flight, definitely never experienced this before..  a quick task manager check shows that 2 of my 16 cores (AMD 5950x) are continuously pegged at 100%, that’s definitely the culprit, was never the case before the last update. I tried a custom mission and had seemingly no performance hiccups, I suppose because I have a sufficient number of cores left, but much increased cpu temps and louder fans are not something I look forward to.

Thanks ED for fixing this asap.

[MoleUK]

20 minutes ago, db349 said:

Same problem here,

Launching DCS and arriving on the menu screen, I hear my CPU fans going almost full tilt and staying there even without doing a flight, definitely never experienced this before..  a quick task manager check shows that 2 of my 16 cores (AMD 5950x) are continuously pegged at 100%, that’s definitely the culprit, was never the case before the last update. I tried a custom mission and had seemingly no performance hiccups, I suppose because I have a sufficient number of cores left, but much increased cpu temps and louder fans are not something I look forward to.

Thanks ED for fixing this asap.

CPU cores being pegged at 100% (1 with SMT off, 2 with SMT on afaik) while on the main menu is actually an old problem that pre-dates this recent bug. But when those 1-2 cores were pegged at 100%, the other cores would mostly be idle and temps would be normal.

Though I do wonder if the core pegging problem is related to this new spike in usage, as I never believed it was normal behavior. But it is long-standing.

Thread on the core pegging here: 

I have always felt that there was something very off about the menu/UI performance generally in-game, something is using waaaaaay too much CPU time. But it's just a gut feeling I've had for years now. Just look at the way the game can absolutely chug while refreshing lists on server select, or when role select is open in MP servers.

Ultimately it doesn't matter too much if it's only limited to the UI/Menu performance. But we have seen problems in the UI spillover into general performance problems before, when players joining servers (or just reslotting) cause a server-wide stutter due to the role select menu refreshing it's entire list.

Edited May 26 by MoleUK

[Alireza.kh]

i saw this problem too with AMD 5600X since the update. high CPU usage and temp at main menu and also in game. temp reaches near 80°C (15°C hotter than normal), 

also i see no improvement in case of gameplay or loading times.

generally higher CPU usage and temp is sign of better optimization for heavy games like DCS but in this case i see no improvement.

Edited May 27 by Alireza.kh

[BIGNEWY]

It is a bug, the team are working on a fix currently. 

As soon as I have news about a patch I will let you all know. 

thank you 

[okopanja]

Was this an issue before?

I recall that in the past the F10 would max out FPS rate which would bring temps up. At some point in the past year or two this stopped, so switching to F10 would bring temps down.

E.g. there is already another regression in score board where number of kills is not updated.

Since issue with the scoreboard happened several times already, I assume the issue is recreated whenever ED merges long running branch into trunk(assumption: they still use svn), by overriding the fix.

Edited May 27 by okopanja

[Gunfreak]

7 minutes ago, BIGNEWY said:

It is a bug, the team are working on a fix currently. 

As soon as I have news about a patch I will let you all know. 

thank you 

Have the team found that my problem (less than 10fps and no GPU) use is related?

Also again asking for the previous version to be added to steam. So I can play and confirm it was the latest update that broke my game.

[draconus]

6 minutes ago, Gunfreak said:

Have the team found that my problem (less than 10fps and no GPU) use is related?

It may be - CPU gets too hot (you have to check it) and starts to throttle back, lowering performance, thus causing the CPU to be the bottleneck and GPU waiting for the CPU, thus lowering its usage.

[Gunfreak]

My problem doesn't seem to be the same. 

 

I made a completely empty  mission, FPS good, CPU usage seems normal, CPU temp normal

 

 

When I hit play 

It's also normal 

 

My problem does not seem to be related to high CPU temps or CPU problems, temps never go over 70 even on the missions that run at 7FPS

Having tested empty missions, and mission with 100s of units, something seem to have happened with AI logic, suddenly AI ground unit movement tax the system 100 of times more than it did before the patch.

Before the patch a mission ran fine with 400 units moving and shooting, after the patch same mission gives me 7FPS. And it seems to be related to AI logic usage. Which is fine, AI does use resources, always has been, but there is no reason the same mission should run fine before the patch, but not after.

[Roughneck]

So to state up front…I am computer illiterate.  All of this is Greek to me.  But last Thursday after installing the latest update I started getting “login session expired” crashes.

 

Yesterday morning I had a “login session expired crash, restarted the game…then had a full computer crash and reboot.

 

My CPU temp is sitting at 71 degrees at the main menu.  I’ve never had an issue with crashes on this computer until now.  I feel like all of this has to be related to high cpu temps.

[mosshunt]

My 5950x hasn't crashed but temps are up in all circumstances, the biggest thing I have noticed is stutter in VR that I had not noticed in the last version this is an abrupt drop to anywhere from 5 - 36 FPS for around 0.5 second then it will recover. It clears up when I reduce the amount of AI units in the mission suggesting its also related to this CPU bug.

Note the very same mission was smooth in the last DCS version & also note its the new CW Germany map.

System: 5950x, 64GB, 2TB NVMe, 7800XT

As above us  steam users would like an ability to roll back as its likely with the big updates ED are promising this isn't going to be the first update induced bug.

[SmirkingGerbil]

System Ryzen AMD 5600, Nvidia 3080 RTX 10GB Vram, Corsair 1800 DRAM freq 32GB.

Most settings maxed with DLSS etc. View range, preload maxed.

Following some earlier advice, I moved my boot drive to a NVMe drive.

Frame rates are back at VSync cap of monitor of 165 FPS, stutter is almost non-existent, even on initial load in and startup. Load in much faster (for obvious reasons).

Back to running like it was on an old Mechanical HDD, prior to the last two updates. Now on NVMe, and running better than ever, except my CPU does run around 70 Deg C vs. about 55 Deg C before.

TLDR: Moving Windows 11 Boot from Mechanical HDD to NVMe restored the type of stutter free, and initial load in stutter (or lack of) that I had prior to the last two updates.

Not sure if that is helpful but FYI.

[Prometyus]

9800XD it goes up to 85°C free flight in Syria map

[Flia]

We really need that hotfix, gentlemens.