I’m gonna start using efb again tomorrow and see if stutters come back as I’ve been using the combination of no efb, unplugging console for 30 seconds. The other day after a 7 hour flight I spawned at some airport again, took off, some stutters. Did it again, more stutters. Shut down the console and unplugged for 30 seconds. Turned back on, spawned on a runway, no stutters again on take off and smooth climb. Sometimes this sim twists my mellow man
I have discovered something… normally I like flying Airbus. I have just tried the default 737 MAX and guess what… EFB did not impact performance at all, nor prior to flight, nor during flight. Don’t know if it is also related to certain aircraft, or if problems randomize from person to person… So for now I will stick to Boeing…
The EFB bug may be aircraft dependent, but it’s not just limited to the Airbus.
I can confirm it exists with the default 737, at least in career mode. Prior to SU3 I had buttery smooth performance on the Asobo 737 in career mode. Since SU3 it’s awful if I open up the EFB. Without touching the EFB things are fine.
However, when I fly the PC-12 in career mode the EFB does not seem to affect the performance. Perhaps because it’s less complicated.
In any event, SU3 did break career mode in the 737 for me. And I’m on a fairly high end system with a RTX 4090 GPU.
Hopefully they isolate and fix this bug.
Correction to my earlier post. This bug also affects the PC-12 in career mode. Had about 20 fps drop when opening EFB vs leaving it alone
Maybe try reinstalling or changing your GPU drivers, or reinstalling the aircraft.
ISSUE DESCRIPTION
Description of the issue: There is a gradual performance degredation when creating a flight plan in the EFB - at least in the default 787 at major airports (flight planning at the gate) - but it never recovers. I enabled the native FPS counter overlay to see what might be happening, and it appears to be degradation of CoherentGTUIThread upon clicking “Find Route”. The degredation seems to pulse every 2 (or so) seconds, but it gets worse and worse, never recovers even if you clear the flight plan, close the EFB, or pause and resume, etc. Repeated behaviour in the default 787 at KLAX and KJFK.
Edit, I tried at EGLL, and with a longer flight plan (EGLL to CYYZ) it degraded much further, so length of flight plan may be a factor.
FREQUENCY OF ISSUE
How often does this occur for you (Example: Just once, every time on sim load, intermittently)? Every time.
REPRODUCTION STEPS
Please list clear steps you took in order to help our test team reproduce the same issue:
-
Open FPS Counter, choose 787 Dreamliner (2024), and load flight in to a gate at a major airport (eg KLAX gate 152, KJFK)
-
I did a walk around (not necessary), Enter the cockpit cold and dark, and let the scenery load and watch the FPS settle until stable. You can change views pan around, and everything is basically stable…
-
Open the EFB and select Departure KLAX and Destination KORD, and click the Find Route button. Then observe CoherentGTUIThread as it starts to stutter red, gradually at first, every 2-3 seconds, but increasingly getting worse, until performance degrades permanently.
-
The main problem is it does not recover. Clearing flight plan or closing EFB does not reverse the issue, which just continues to degrade until extiting the flight.
-
This may only happen in the 787, and maybe only at large airports, maybe only with Ultra settings.
-
I was able to open the EFB with the same settings in the Longitude, and C172, with no immediate issues.
-
EDIT - I just tried the 787 at EGLL and after opening the EFB and creating a flight plan, it degraded heavily after a few minutes, freezing every few seconds. Perhaps length of flight plan is a factor??
YOUR SETTINGS
If the issue still occurs with no mods and add-ons, please continue to report your issue. If not, please move this post to the User Support Hub.
No addons, only Default MSFS 2024 Premium Deluxe, no downloads, only streamed, default settings.
What peripherals are you using, if relevant:
- Microsoft wireless keyboard and mouse
- Xbox controller (wired via USB-C)
[PC Only] Are you using Developer Mode or have you made any changes to it? Yes, just to open the FPS counter, then Quit Dev Mode (FPS overlay stays open)
[PC, MSFS 2020 Only] Are you using DX11 or DX12? DX12
[PC Only] What GPU (Graphics Card) do you use? RTX 5090
[PC Only] What other relevant PC specs can you share?
- 9800X3D
- RTX 5090, current driver 581.15
- 96 GB DRAM 6000 CL28 on QVL
- MSFS Graphics Preset Ultra (Default chosen by MSFS upon install)
- TAA rendering at 4K
- I have set Max Frame Rate 30 with DLSS Frame Generation targeting 60 FPS (very smooth until EFB is used)
- Live Traffic, Live weather
- Edit: I tried again, changing TAA to DLSS Super Resolution at the Quality setting (which renders at 2K and upscales to 4K), still with Graphics Ultra Preset, and the issue seemed less, but, when I loaded a longer flight plan (EGLL to CYYZ), the issue got worse.
MEDIA
Sitting in 787 Cockpit at KLAX Before opening EFB, steady 60 FPS:
Now open the EFB, enter Departure KLAX and Destination KORD, click Find Route, and watch CoherentGTUIThread start to degrade:
Graphics settings (work very well except in the above scenario):
EDIT - I tried another test, this time instead of TAA at full resolution, DLSS Super Resolution at the Quality setting (renders 2k, upscales to 4k) - and still the Graphics Preset of Ultra… At first I thought it might be better, but after loading in to EGLL, 787, DLSS, Ultra Preset. All was smooth until opening the EFB and creating a flight plan from EGLL to CYYZ… after a minute or 2 it degraded to freezing every few seconds - so perhaps related to LENGTH of flight plan?
I’m also encountering this issue, specifically on the “free flight” screen (didn’t try once the flight was started)
MSFS 2024 - EFB latency SU3
It wasn’t an issue on SU1 (here on a video I was doing for another issue on SU1)
MSFS2024 - 747 aileron issue - SU1
Can confirm the issue happens for me when I toggle auto FL in the EFB Route Planner. As soon as auto is toggled it will gradually lag the sim more and more until it is unplayable. I have noticed this while flying the Cessna Citation CJ4.
Thank you for the bug report.
We have created an internal ticket to see if our team already has this logged, and if not they will attempt to reproduce the issue and create a new bug report. This item is now marked as feedback-logged. If there is an existing bug report or one is created, we will move this thread to bug-logged.
1 Like
Flown General Aviation for months. Decided to push my Career into the big planes.
After getting jet licenses I found the ‘special mission’ which is a 737 Max flight to Incheon. Here is what happened after 20 minutes. Its down to 20 frames per second, usually its 50. RAM use usually under 32GB. Here its just ramping up and up while the jet is at Cruise. CPU and GPU are relaxed.
No addons installed. This is unplayable. Starting to sense why Twitch streamers are not streaming MS2024 live unless its bush flying. Restarted the sim and it did the same thing.
I have been facing the same issue, but in a very specific circumstance.
The stutters started for me suddenly some time after 15th September, before that I had the sim tuned very much to my liking.
The symptoms I get are stutters of about .25s that occur every 3secs or so. It makes the sim unusable, and the time between them decreases the longer you (keep trying to) fly the sim. The stutters also persist to the flight planning screen if you end the flight, the map does not scroll smoothly, but stutters at the same rate as experienced in flight.
I usually fly in VR (Meta Quest 3) connected by Virtual Desktop but the same stutters occur outside of VR as well.
I have narrowed down the cause to opening the EFB while in the flight planning screen. If I don’t open the EFB there, the stutters do not occur, in VR or non-VR. I can open the EFB once loaded into the sim and are in the aircraft. I can still load my flight plans from the cloud through the EFB and no stutters occur. Opening and closing the EFB while in flight does not cause stutters, it is only when it is opened on the flight planning screen. I haven’t tested whether it is related to the Auto-FL control as mentioned up thread, but that might be something to test.
My system is reasonably high-end, i9-13900KF, 64GB RAM, Nvidia RTX4080-16GB, NVME drives.
I did a full re-install from scratch on the weekend, which made no difference; the stutters still occurred on a fresh install with no addons installed, even leaving the settings at the defaults from installation.
I have uploaded my DXDiag file with full details of my system.
DxDiag.txt (132.1 KB)
Oh my god, this post is a godsend. I thought i was going insane - I play on PC and Xbox Series S - series S has never been great, but I was trying everything (and i mean EVERYTHING - bios firmware updates, toggling every graphics setting in game and in NVIDIA manager, clearing cache, changing cache size, locking frame rate) - literally nothing would fix this problem.
It was so frustrating too because it was so clearly describable - an obvious pause, every second, like a clock, that got worse and worse over time as soon as it “started” happening, and it even happened in the pause menu!
I started manually setting my flight levels in the EFB in career mode just out of another random following of a career mode tip, and my sim ran like glass all week. I unlocked the Citation X Longitude, and started accepting the “auto” generated FL450 thinking that would be ideal - suddenly, I could no longer even get to the point of boarding my passengers, the frame stutter would be so bad.
Finally after finding this post, I tried to load up the same mission that i couldnt get to run all day, but this time entering my own FL manually, and wouldn’t you know, the game runs like a clock again.
Asus z590 Wifi
GTX3070ti
64gb RAM
Yeah I don’t use the efb. I bought a tablet and plan my flights on that, the online flight planner and it seems to really help with the stuttering
can you use your external tablet to send the flight plan to ATC and avionics? or is it just an offboard flight planner that you use to set your plane up?
No you can’t send the flight plan to avionics but I set everything up on the online planner, then go into say the a350, and plan my flight from the online planner into the plane computer. Then I’ll just access charts etc from my tablet. It would be pretty cool if in the future they do let you send your plan from a tablet to the plane
I’ve had the same issue. I finally tracked it down to having many waypoints loaded in the EFB for an IFR flight plan. Tried KLAX to YSSY which generated about 30 waypoints. The sim crawled to an almost stop. I managed to reduce the waypoints back to 5 and the framerate recovered.
For now, I would not recommend using ‘Jet Airways’ or ‘Victor Routes’ when generating a flight plan. Just use direct for everything and limit the amount of waypoints generated.
ISSUE DESCRIPTION
Description of the issue:
I think I have identified a memory leak related to the use of charts with the 2D or 3D EFB in MSFS 2024. I saw a noticeable increase in VRAM usage at the end of flights, making the approaches very difficult with stutters, low FPS and VRAM going over limit.
I discovered that not using the built-in tablet or EFB changes everything and the VRAM usage lowers during the cruise, allowing enjoyable approaches and landings.
I did several test flight including one with the community folder completely emptied, no use of external software. The flight was FRA-PMI, with the A330-300RR. I conducted the flight twice with same weather, same time, and same settings. Once using the (2D) EFB to read charts, once without touching it. Here are the VRAM usage (first number with EFB, second without).
- Lined up: 5.5 vs 5.25 GB
- Reaching 25k ft: 5.0 vs 4.5 GB
- Over Lyon: 5.0 vs 4.4 GB
- TOD: 5.1 vs 4.35 GB
- On ILS: 5.3 vs 4.7 GB
- Touchdown: 5.7 vs 5.1 GB
So approximately 0.6 GB VRAM difference (and much more stutters). For my modest system (8 GB VRAM), this makes a big difference.
On another flight I repeated with the iniBuilds A340 (ZRH-PMI), the difference was up to 0.9 GB with and without using the in-game charts (read on the 3D EFB). I also noticed it (but don’t have numbers) on two flights with the iniBuilds A350 (GVA-ADD, noticeable difference of VRAM usage), and on flights with the fenix A32X.
I don’t think that the loading of a few 2D charts would consume that much VRAM, that’s why I think there is probably a memory leak here.
WORKAROUND:
Before being fixed by the development team, you can use the (exceptionally good) online MSFS flight planner ( https://planner.flightsimulator.com/ ) on another device (iPad,…) to access all your charts. I had forgotten about this flight planner but if you have a (real) tablet, it’s actually much better than using the in-sim EFB. With that, I don’t even touch the in-sim charts and I can now really enjoy my airliner flights, with excellent performance during the approach, and could even tune my settings a bit up with this spare VRAM.
FREQUENCY OF ISSUE
How often does this occur for you (Example: Just once, every time on sim load, intermittently)?
Each time I use the in-sim charts, independently of the aircraft.
REPRODUCTION STEPS
Please list clear steps you took in order to help our test team reproduce the same issue:
-
Conduct an airline flight
-
Use either the 2D or 3D EFB to check your charts.
YOUR SETTINGS
If the issue still occurs with no mods and add-ons, please continue to report your issue. If not, please move this post to the User Support Hub.
Issue was repeated with no mods and add-ons.
What peripherals are you using:
Just a basic thrustmaster T.Flight Hotas
[PC Only] Are you using Developer Mode or have you made any changes to it?
Using developer mode to display FPS but made no change.
[PC Only] What GPU (Graphics Card) do you use?
nVidia GeForce RTX 4070 (8Go VRAM)
[PC Only] What other relevant PC specs can you share?
CPU: AMD Ryzen 9 7945HX
MEDIA
Just showing here the screenshots established on ILS but I can show you the screenshots of the other stages if you don’t believe my numbers. 
ISSUE DESCRIPTION
Opening the EFB on the World Map or in-flight, specifically when accessing the Route Planner or Charts—causes a severe and fully reproducible CoherentGT UI memory leak.
This results in:
- GPU utilization collapsing from ~90% → ~10–20%
- FPS dropping to 1–5 FPS
- VRAM usage rising continuously without ever releasing
- CoherentGT scratch caches hitting the hard 4096 MB limit
- Negative texture-deletion counters (bookkeeping corruption)
- UI thread stalls at ~1000 ms intervals
- World Map becoming unresponsive and impossible to exit
- Performance never recovering even after closing the EFB
- Simulator requiring a full restart
This did not occur in SU2.
This occurs even with zero addons, default aircraft, default settings, and clean install.
FREQUENCY OF ISSUE
100% reproducible, every single launch.
Occurs:
- when opening the EFB on the World Map
- when selecting Route Planner or Charts
- independent of aircraft
- independent of location/weather/settings
- with mods or without mods
- DX11 and DX12
- clean configuration
- fresh rolling cache
Performance degrades immediately and does not recover.
REPRODUCTION STEPS
- Launch MSFS 2024 SU3.
- Open World Map.
- Select any default aircraft.
- Open the EFB.
- Navigate to Route Planner or Charts.
- Observe:
- GPU drops from ~90% → ~15–20%
- FPS begins collapsing over seconds
- VRAM grows continuously
- UI stutters once per second
- World Map becomes unclickable
- Sim must be restarted
If a flight is started afterwards, the leak continues and game becomes unplayable.
EXPECTED RESULT
- EFB should not cause memory leaks.
- GPU load should remain stable.
- CoherentGT scratch textures should not saturate.
- VRAM should be correctly allocated and freed.
- World Map UI should remain responsive.
ACTUAL RESULT
Opening the EFB causes:
- continuous texture allocations
- massive VRAM leak
- CoherentGT scratch caches pegged at 4096 MB
- negative deletion counters
- UI-thread heavy stuttering
- World Map freezing
- permanent FPS loss
- eventual CoherentGT crash
TECHNICAL EVIDENCE (BEFORE → AFTER OPENING EFB)
Before:
TexturesToDeleteTotalSize = -262144
scratchCaches = 4095.999999 (all categories)
VRAM (texGpuKiB) ≈ 1.19 GB
AllocatedMem ≈ 8.43 GB
GPU ~90%
After opening EFB:
TexturesToDeleteTotalSize = -9437184 (corrupted)
scratchCaches = 4095.999999 (full saturation)
VRAM (texGpuKiB) = 1.68 GB → rising continuously
AllocatedMem = +820 MB in under 30 seconds
frameCoherentKiB spikes > 8000
GPU drops to 10–20%
World Map becomes unresponsive
Renderer behavior:
- Dozens of new 2048×2048 CoherentGT_Backend_Z textures spawned
- Old textures not freed
- Scratch-cache allocator in a failure loop
- UI-thread starvation → 1s frametime stalls
- Leak fully resets only on simulator restart
This is consistent with a CoherentGT HTML5 canvas leak.
SYSTEM SPECS
CPU: Intel i9-9900K
GPU: NVIDIA GeForce RTX 2080 – Driver 32.0.15.8157
RAM: 32 GB
OS: Windows 11 IoT Enterprise LTSC build 26100
Storage: NVMe SSD
Displays: 1440p 75 Hz (dual monitor)
DirectX: DX12
Peripherals: T.A320 Pilot, mouse, keyboard
GRAPHICS SETTINGS USED FOR TESTING
Global preset: LOW
VSync: ON
DLSS: Enabled
Render scaling: 100%
SUMMARY
The EFB in MSFS 2024 (SU3) triggers a consistent and severe CoherentGT UI memory leak.
This directly causes:
- GPU starvation
- VRAM overflow
- scratch-cache saturation
- texture bookkeeping corruption
- 1-second UI stalls
- complete UI lock-up
- permanent FPS degradation
- simulator restart requirement
This prevents normal use and makes the game unstable.
It seems with SU4 I couldn’t somehow to reproduce the issue with EFB, but I didn’t have lot time to test more intensive. Can anyone else confirm if still have issues or it is solved for others too? I will come back with a feedback when I will have more time for testing.