First off, I’ve cleared my dx cache folders. That fixed the issue of the immediate slideshow.
However, I still got bad stutters when landing on runway 22 so I removed my Tokyo Haneda RWY16L scenery by KAZE. That fixed the stuttering issue at RJTT, even with FSLTL on.
Now, I tested it out at Fukuoka with SNJSim RJFF. Immediately it happened again; the stuttering during takeoff and landing, and it seems as if flying close to the airport vicinity will introduce massive stutters. Looking inside the cockpit will restore the fps, but as soon as I look outside, it stutters again.
Here’s a sample of my FPS counters:
Notice in the background how smooth panning is, and as I move the camera outside, the stutterfest begins
This was taken while I was on the outside camera view. Memory usage looks very high so I’m wondering if it’s a RAM/VRAM issue
And then smoothens as I go farther out from the airport.
The only conclusion I can come up with is that something in SU15 has messed up, and now some of my sceneries have become unplayable on DX12. I used to be able to play on DX12 with frame gen on my 3080 with stutters here and there which were acceptable to me.
Maybe I should just accept that I can’t use frame gen anymore until something is fixed. So I’ll just go back to using DX11 for now
Look at the last line (GPU mem) and you’ll see your maxed out on VRAM, which causes memory thrashing. Reduce texture resolution until it stays comfortably below 8GB. Your RAM is having the same issue but let’s see what it does after the texture resolution change.
And alas, the most obvious solution was in front of me the whole time. I tried playing with my settings again and found a good balance of High and Medium settings with a few options on Ultra.
I guess I was caught up on trying to use the same old settings I used to have which were cranked.
Still, I think it’s quite strange that the settings I used to have pre-update don’t work anymore and now I have to lower them just so that I can use DX12 with FG.
Well that sounds like a solution for your issue - but to be honest, a 15th update of a game should not decrease performance and force people to reduce their quality settings.
For me DX11 is not an option due to worse performance; also my stutters are not RAM/VRAM related, there’s always plenty headroom.
Anyways, for my airport stutters I can happily report progress.
Since yesterday I did (additionally to all the mentioned cache wipes):
Radeon driver utility cleanup and re-install
Ryzen chipset driver update/reinstall
FS2020 reinstall
and:
only installed the WU/CU of relevance for me
only installed a few “original 1st party” addons; no 3rd party marketplace content and no community folder content
So far my DX12 “main thread limit horrible 20ish FPS” issue is gone. Tested Frankfurt, Charles-de-Gaulle, Barcelona, Tokyo. Now it’s able to mostly keep above 40FPS, with some rare drops below/occasional lagspikes.
Next task will now be gradually adding my (not many) 3rd party contents and carefully watch the impact on FPS.
EDIT:
found the evil FPS killer: ENHANCED RUNWAY LIGHTS from the marketplance by FLYT Simulations.
That also explains why it only happens at bigger airports (more lights…)
Reducing the FPS by 20-25 for me now. I’m pretty sure this was not the case before SU15 (although I rarely fly big airports).
Pitty that… it’s a great improvement in low light/night. I will inform the developers.
Here’s a video of my RJJT and environs test. See my post above for my sim settings.
Sorry if the video looks cruddy. I recorded it with HDR on, and I don’t think that translates well to YouTube.
Oh WOW, this finally fixed the stuttering around airports for me too! I’ve been scratching my head for a long time about why my performance tanked so much in some areas all of a sudden in DX12. Disabled the ENHANCED RUNWAY LIGHTS and everything is good again!!
The main person (thread) is the one that has to do most of the work because the others on the team haven’t been taught how to do it. This just keeps them much busier and makes their work critical path. To some extent the main thread is also bringing together the work done by other threads and doing some of the coordination. A bit like a team leader that’s not doing a very good job because they haven’t learnt how to delegate effectively yet.
I found that one very interesting. YouTube recommended it to me even before I saw this link, obliviously yt is doing a good job.
I did read the description and all of the comments. For sure you have that special tool setting tlod way too high at ground level, tlod has the highest impact of any of the gfx quality settings and there’s nothing to be gained with such a high tlod at ground level. I find it surprising that you’ve not had stutters with those settings in any other locations (LN NY TK LA?).
YPAD is my local and it’s never performed well, Impulse Simulations has copped it somewhat for poor performance of their scenery (new update just out with a lot of improvement) but here you don’t even have that, you get awful performance at the autogen airport (which incidentally also looks horrendous - Impulse upgrade well worth the money!).
I wonder if there is something else going on in the region with the Aus world update, I don’t remember the local stutters from before then. I assume you don’t have the Orbx Adelaide scenery since you don’t have the airport.
Hey I have a question. I cant create new topics and I’m trying to downloads updates of Flight Simulator and the downloads restartas and restarts and restarts, I need to wait days literally to play a game!!! When they will fix downloads servers? Why needs restarts and restarts downloads when connection fails? This is prehistoric nowdays!
Okay… just when thought the game fixed itself, I made a full flight (FSLTL and all). And lo and behold, really bad stutters on final. Same as @sloppysmusic .
It was a 3hr flight with the Fenix A320; I wanted to test out the effects of long flights with FSLTL. Throughout most of the flight it was pretty smooth, until I got some microstutters on short final and then finally a slideshow once I got close to the runway.
What’s worse is that @sloppysmusic has a 4090 with 96GB of RAM, so something must really be wrong with the DX12 version of the game.
I know that SU15 is supposed to be the last update for this year, but I HOPE they can get this sorted out by releasing a patch/es.
I know we all have different experiences. But I have found SU15 plus dx12 great. Possibly a small decrease in fps but very smooth. And so far, all the strange scenery errors have disappeared. For instance, the large white area on approaching NZCH.
Richard
Just another reminder to ALWAYS check dev mode FPS display when performance deteriorates inexplicably since it gives invaluable insight concerning thread use and RAM/VRAM thrashing.
I have never had any issues of substance with updates. This begs the question: are there any benefits to doing cache clearing if you do not have issues? Would/could it potentially improve performance and/or quality in some way or would my caches have been rebuilt already after a few flights in any case? Are there any risks associated with doing this?
Ironically that tool crashed before I made that video, well su15 doesn’t like it for some reason. So by landing I was running default 370 told and 100 olod. I’m smooth as butter normally. In fact I captured that video live 2k60fps on same machine. Yesterday I captured a test one at 4k60fps, also dead smooth. 60 fps all flight dropped to 45/50 at airport. So pc is fine if it can run ultra settings and capture 4k60fps at same time! Something is wrong with scenery in some places.
Thanks for the post, that’s really weird I have to admit, its obviously main thread limited but its odd when you go outside the plan the sim then goes into stutter fest.
Quick one, does the SIM do the same thing when you are at a 1920x1080 resolution?
The reason I ask is you have 16Gb RAM and its being exhausted, and your VRAM Framebuffer on the GPU is also close to exhaustion as well when you are close to landing. I suspect this is tipping you over the edge and its having to swap to disk. If you try at a lower resolution I’d be interested in seeing if it goes away.
Yeah I guess I ought to try a different resolution. Although, it’s not really an option for me since I have a 1440p monitor and switching to 1080p makes everything look blurry.
Using DLSS would also make the displays on glass cockpit aircraft quite blurry as well.
Maybe I should do a flight without FSLTL.
My last resort would be to add more RAM to my system, but I’m having second thoughs seing that @sloppysmusic has a 4090 and 90+GB of RAM
Its a case of just lowering the resolution to rule things out at this stage. If we keep it inside the memory cap so it doesn’t swap to disk, and the frame buffer isn’t exhausted and it becomes smooth, then we have a way to move forward, for example adding more RAM.
