Low FPS while CPU & GPU very under utilized

[CaptainMoose 6]

Suffering from very low FPS (29-32 FPS and 10-15 FPS in VR) regardless of the scenery payware. I have an x8086 OC @5.2GHz, a 1080Ti OC edition @2025MHz, PiMax 5K+ headset.  Running P3D v4.5 in mid to high settings (2048/x16/4SSAA).  Both CPU and GPU are in the 50s% and temps are around 50-60C too. 

I just updated my Nvida driver to 441 and still, the problem persists.  I am not CPU, GPU, or Monitor bound and  Task Manager > Performance tab and HWMonitor are showing everything at or well below 50% utilized across the board!!!

Thanks,

Mustafa

 

[Nyxx 6,993]

It would help more if you could show us all your setting in screenshots please.

[Bob Scott 7,721]

If you're looking at *total* CPU utilization, it's not telling you the real story.  The limiting factor on CPU performance is the Core 0 utilization, which can be maxxed out at 100% with the other five cores down in the teens when terrain/texture loading is not occurring--the "total" CPU load across all six cores might be 40-50%, but you're still against the CPU wall due to the load on Core 0 where the main thread runs.

[downscc 1,327]

Changing from SSAA to MSAA settings will have a significant impact on performance.

[Wanthuyr Filho 83]

Today I notice a strange drop of FPS (pretty massive) arriving at Dublin in the PMDG B748 and went into investigation. It was nighttime, some moonlight which made the clouds excessively alight for my taste (it started happening in the latest P3D versions since modifying shaders doesn't seem to make the expected changes anymore) and nothing that would seem to create this performance loss. I noticed that CPU was not very utilised, not even Core Zero was near full capacity, instead the video card was at 100% usage, it's a 1080 TI. Curious about it.

[Michael Moe 495]

For some reason the online Vpilot  software in combo with FSL drains my CPU and FPS performance.

At first glance its difficult to find the reason for the fps drop and looking at CPU usage its taking about 10-15% of the total.

A restart of the software sometimes help.

Maybe third-part add-ons can have a simular impact so try without any and see if its related to P3D itself or something outside

Michael Moe. 

[CaptainMoose 6]

I figured it out. It was my Pimax 5K+ VR headset terrible software (PiTool) that was sucking all the FPS and somehow draining every last bit of core 0 processing power. After fiddling with it for hours at end and changing to all sorts of versions, I gave up and went back to my Samsung Odyssey+ headset, lesser FOV but decent enough. I immediately went from 14 FPS at FlightBeam's Dulles KIAD on the Pimax to 28 FPS on the old Samsung headset, what a waste of time and money.  I'm a happier camper now :)

I really hope MSFS 2020 will have better FPS when running on all cores, and I hope they release it VR ready.

Thanks all...

Mustafa

[Mace 1,927]

On 12/8/2019 at 9:15 PM, Wanthuyr Filho said:

Today I notice a strange drop of FPS (pretty massive) arriving at Dublin in the PMDG B748 and went into investigation. It was nighttime, some moonlight which made the clouds excessively alight for my taste (it started happening in the latest P3D versions since modifying shaders doesn't seem to make the expected changes anymore) and nothing that would seem to create this performance loss. I noticed that CPU was not very utilised, not even Core Zero was near full capacity, instead the video card was at 100% usage, it's a 1080 TI. Curious about it.

What you are seeing might have been SSAA + HD both on.  Have a 1080ti as well, and at night that heavily impacts performance.  Were you running SSAA + HD lighting during your arrival?