Is this a new 'characteristic' of the sim?

I notice it has been 'choppy' when on the ground lately, even at the smallest of airports.

I brought up my GPU software.  When flying, at my usual settings, I get super-fluid 30 FPS and GPU is at 75-85%.

I have watched the graph in my GPU software, and the second my wheels touch the tarmac, it flat lines at 100% GPU and of course the frame rate gets choppy.

If doing a touch and go, once again, as soon as the wheels leave the tarmac, back down to 75-85% GPU usage and really smooth frame rates again.

Why would this happen?  You see less on the ground than in the air, so it seems counter-intuitive, but it seems to exactly correspond to surface contact (of the wheels).  Anyone else has this or can confirm?

I have tried in C152 and C172 classic.

Edited April 25, 20215 yr by bobcat999

do you have Bloom ON?

I wonder too. No bloom on my side.

During very short final and especially on touchdown FPS goes low GPU usage hits %100 and then performance stabilise a bit after slowing down. But in general on ground GPU really works hard. After lift off and reaching 1000+ GPU seems a little relaxed.  

Kind regards. 

Same problem here.  Just started recently.

40 minutes ago, sightseer said:

do you have Bloom ON?

I do, but why would that affect it? 

I could try with it off if you think it would do anything, but tayyareci has bloom off, and can also see it.

I turned it off and got 5FPS. ☘️

bs

1 hour ago, bobcat999 said:

I do, but why would that affect it? 

I could try with it off if you think it would do anything, but tayyareci has bloom off, and can also see it.

There are probably multiple things effecting FPS near the ground. Bloom in game seems to be a combination of a fake lens effect combined with a substitution for true ray tracing for the lighting around runway and terminal lights (and from your aircraft itself) reflecting off things, which will indeed be ONE of the contributing factors to higher GPU usage near an airport. What is curious though is you still get this GPU hit even during the day.

Edited April 25, 20215 yr by Glenn Fitzpatrick

@bobcat999  I'm just searching for answers.  I've had that same frustration as you -- performance seems pretty good and then you land (also happens taxiing for takeoff) and things get all kinds of bad/choppy.  I was experimenting today and found Bloom was hitting me hard but only right near runways for some reason.  It may be nothing or maybe part of the problem or or or...this fantastic sim can drive you mad 🙂 

4 minutes ago, Glenn Fitzpatrick said:

What is curious though is you still get this GPU hit even during the day.

all the runway lights are on in the daytime.  maybe they have a texture issue like they apparently did at that airport near DFW.

With the FBW320 on the ground if I put the taxi -1 fps less if I also use the landing lights -1 -2 fps less!
So on the ground with the headlights on I lose about 3 fps on the ground ...

23 minutes ago, Axis3600 said:

With the FBW320 on the ground if I put the taxi -1 fps less if I also use the landing lights -1 -2 fps less!
So on the ground with the headlights on I lose about 3 fps on the ground ...

Yeah the Mooney is like that as well.

4 hours ago, Glenn Fitzpatrick said:

Yeah the Mooney is like that as well.

True!  There seems to be an issue with the lighting on the Mooney which I don't seem to have on other aircraft.

Edited April 26, 20215 yr by bobcat999

I am having the same issue except the stutters are gone as soon as I touched down. It's basically from around 300 feet to touchdown.

Well, I tested this some more tonight.  What a weird little bug!

First of all, light bloom had minimal effect on or off.  I couldn't really tell much difference in GPU utilisation, as the graph still flatlined at 100% usage when the plane was stationary, even when bloom was off.

What I did find was that it is inexplicably related to ground speed.  Once above about 20 knots on the runway, GPU usage dropped to normal for me (about 75%). 
If I braked and brought it down to zero speed again, GPU went straight back up to 100% and choppy frame rates came back as you would expect.

Flying and holding 50 feet AGL down the full length of the runway at 65-70 knots (C172 on flaps), GPU was at 75% for the full length of the runway and completely smooth frame rate.

I have tried countless airports now.  With the last one I flew south from Sedona to Prescott.  GPU usage was as low as 61% at 1000 AGL on approach.

I started to think it was a mid-runway thing at all of the airports, but of course, that is just a natural stopping / slowing point.

If I landed and stopped mid runway, GPU hit 100% usage again, and if I accelerated again, once over about 20 knots, the GPU usage immediately dropped down to about 75% again and smooth.

When stopped, I found the GPU usage goes up to 100% in both internal and external views, and when picking different cockpit views or rotating the camera - just plain weird!

I will Zendesk it.

9 minutes ago, bobcat999 said:

When stopped, I found the GPU usage goes up to 100% in both internal and external views, and when picking different cockpit views or rotating the camera - just plain weird!

 

What happens if you limit fps to 30 in the sim?