Limited by Main Thread but none of the threads are actually maxed out

[Zaakuro2796]

The performance has given me a bit of a headache as of lately. As you can see, the sim says I’m main thread limited, however, none of the cores seem to be running at its full potential. I really don’t know what to do because it is very frustrating to fly like this, especially when doing it on a network where I may need to do a lot of camera movements to set up the aircraft and everything, the camera stutters are especially annoying. I need help, maybe you guys can find a solution to my problem, I think I’ve tried almost everything, but I really don’t know what to do anymore. Maybe my settings are too high, but lowering them doesn’t make much of a difference. Thanks in advance

My system:
CPU: Ryzen 5 3600
GPU: RTX 2060
RAM: 16 GB 3200 mhz
1440p resolution

[WellREDBarron]

I wrote this in another thread yesterday. It might help.

@WellREDBarron

That isn’t a great way to see what the Main Thread is doing.

You might be able to spot issues like a core running at 100% would be a clue as to what is causing a slowdown. Or minimal usage across all cores could be a sign your slowdown is coming from elsewhere and not the CPU… but…

And this is important…

Very important…

The Main Thread is not a CPU, or a CPU core. It is the amount of time it takes ALL cores working together to perform one cycle to calculate data for one frame.

And to this day, even with the best CPUs, it is very likely folks will need to lower their Terrain Level of Detail especially, to get that Main Thread cycle fast enough to meet reasonable FPS requirements, and very tricky to get ultra high fidelity and 60 FPS.

If you are ok with 30 FPS, that can be done on most decent CPUs with a little LOD adjustment. If you want 60 FPS, you need to be prepared to make some real sacrifices. And you still might not get it 100% of the time.

DX11 and 12 do manage CPU efficiency differently and you can see some of those differences in that window, but that is not your Main Thread.

Again, the Main Thread is the amount of time it takes ALL cores working together to perform one cycle to calculate data for one frame.

So, sometimes a core has to wait for another to finish its calculations to be able to build upon the data generated with its own new calculations. Multiple cores working together often means cores are waiting for other cores. That time spent waiting for ALL cores to communicate, build, and perform the calculations needed to finish a cycle and build that next frame is like lag.

You can see some of this lag in the Developer Mode.

[bravetoss07]

It’s simple, put that TLOD slider right back or upgrade CPU. Or hope that some day game with DX12 will be better optimized and use CPU to the fullest potential. To be honest, I have similar machine and I’m almost used to it. Recently I discovered, that forcing Anisotropic filtering in drivers to 16x, disabling it ingame and slightly decrease TLOD increase FPS while visual quality is almost same.