Annoying fluctuating FPS

[apeliver]

Hi Guys!

I hope somebody can help me, or at least give some hints what to do. Here's the issue:

I've been playing FSX:SE for years without any problems, and I never experienced such an issue like this.

Recently I bought a brand new PC, just to run FSX a little smoother. Here are my specs:

MSI B350 PC Mate motherboard
AMD Ryzen 5 1500X CPU (3,5 gHz)
Asus GTX 1050 ti 4 GB GPU (driver nr. 398.36)
16 GB Crucial DDR4 2400 mHz RAM
240 GB Kingston SSD
FSP 500 W Hyper power supply

After a clean Windows 10 x64 (build 17134.165) setup, I installed all the drivers to set my system up to date. After that, I made a clean install of FSX:SE, and tried how it works. Well, not that I expected:

No matter what ariport I'm at, or what default aircraft I fly, in medium-high graphic settings the FPS starts to fluctuate even if I do nothing. For example: I'm in the VC of the default 737 at KSEA with a stable 30 FPS. After a few seconds, the FPS drops down at 8-10, then back to 30. The symptom repeats in every 50-60 seconds.

When I'm at AR51 in a default Cessna - same issue.

I disabled Windows 10 DVR function, because I heard it can cause performance issues, but didn't help.

Any help, hint would be appreciated. Thx!

[apeliver]

Additional info: I checked the CPU / GPU temperatures with GPU-Z, they are in the safe range during gameplay

[deterdzeno]

Thats just an awful pc, get a pentium d + gt 210 and it should run fine, jk put the compiability mode to windows 7/xp sp 3 fixes the prob for me

[TextRich]

Do you have the same FPS problem when you fly? If you start in a city airport, that is when the sim's FPS is at its worst. Try starting at a quieter area and take off, and see if the game at least runs smoothly even if the FPS indicates otherwise. If FPS is still a problem, turn down settings.

[apeliver]

Originally posted by BF Bullpup:

Do you have the same FPS problem when you fly? If you start in a city airport, that is when the sim's FPS is at its worst. Try starting at a quieter area and take off, and see if the game at least runs smoothly even if the FPS indicates otherwise. If FPS is still a problem, turn down settings.

It doesn't really matter which airport I start at. I recorded a little video to show you, what this issue looks like. You can clearly see, FPS drops down in 1 minute intervals.

https://www.youtube.com/watch?v=zJteuNFiAqc

[maelstrom_19]

Originally posted by apeliver:

Originally posted by BF Bullpup:

Do you have the same FPS problem when you fly? If you start in a city airport, that is when the sim's FPS is at its worst. Try starting at a quieter area and take off, and see if the game at least runs smoothly even if the FPS indicates otherwise. If FPS is still a problem, turn down settings.

It doesn't really matter which airport I start at. I recorded a little video to show you, what this issue looks like. You can clearly see, FPS drops down in 1 minute intervals.

It looks as though you have some other app/process running periodically in the background stealing CPU time. Do you have FSUIPC saving in the background? Check Task Manager under the Processes tab and see if anything is using the CPU at the same interval as your FPS drops.

[TextRich]

I agree with n74k2gunz8. Try doing the same thing and see if Task Manager brings up a process that keeps hogging resources at the exact same time your FPS drops. Consistently getting 30 is good. I am usually happy with 25 - anything more than that is gravy.

[apeliver]

Ok Guys, I think I found a solution.

I tried almost everything to prevent these regular stutters (I even set literally all settings to the minimum) but nothing helped.

As jorgen.s.andersen recommended at flightsim.com forum, I read Kosta's tweaking guide, and figured out quite fast, that these stutters somehow connected to my 4 core (8 threads) CPU. So I opened fsx.cfg, added the line
[JOBSCHEDULER]
AffinityMask=84
and the 1-minute stutters disappeared.

I'm still testing, but hope this is the best solution.

[noviceflya]

Will it work for a dual core processor and could you elaborate on the path you took and what you typed in exactly ? Better yet a screenshot of what and where you entered it. Thanks I've had the same issue for months since installing orbx global

[Rogen]

Originally posted by noviceflya:

Will it work for a dual core processor and could you elaborate on the path you took and what you typed in exactly ? Better yet a screenshot of what and where you entered it. Thanks I've had the same issue for months since installing orbx global

Goes into the fsx.cfg (or fsx-se.cfg)

To calculate the values this website will assist.

http://www.gatwick-fsg.org.uk/affinitymask.aspx?SubMenuItem=utilties

Then just open the fsx.cfg in Notepad and add the below line if you don't have it (of course replacing <value> with an actual number value to suit based on what the calculator spits out).

[JOBSCHEDULER]
AffinityMask=<value>


The value will depend on the number of cores you actually have in your processor and which core you want to exclude FSX-SE from using.

For example to exclude core 0 on my processor the value is 65534 (as I have a 16 core processor).

If all you've got is a dual core processor though removing half of the processing power form FSX-SE might not yield very desirable results, but you can certainly give it a try and then comment out the line or remove it if its a no go.

Also you can use Google or search in these forums as there are tons of previous threads regarding affinity masks and the use of.

Cheers