Severe Performance Degradation with DX12

[David Mills 4,774]

I was previously getting a smooth 30FPS even with demanding scenery and graphics settings. Now, with DX12 (beta) enabled, I'm getting a choppy 20FPS. I know that Asobo said there wouldn't be any performance improvement with DX12. But they said nothing about serious performance degradation. Also, DX12 appears to provide no benefit whatever to scenery quality.

[Virtpilot 152]

Yep, same observation after a short test flight. Pity.... 

Edited November 18, 2021 by Virtpilot

[Flyfaster_MTN002 412]

5 minutes ago, David Mills said:

I was previously getting a smooth 30FPS even with demanding scenery and graphics settings. Now, with DX12 (beta) enabled, I'm getting a choppy 20FPS. I know that Asobo said there wouldn't be any performance improvement with DX12. But they said nothing about serious performance degradation. Also, DX12 appears to provide no benefit whatever to scenery quality.

Does the (older or newer) spec of your hardware specs factor into this?

[David Mills 4,774]

My card is fully DX12 capable and runs the sim beautifully at 4K when the default DX11 option is re-enabled. I lose about 10FPS when selecting the DX12 beta option.

[SP2472 2,304]

Direct X12 immediately cashed my system (froze) when loading the scenario, and I have higher end system?

Darryl

 

[Sethos 4,364]

I had at the very least expected it to be comparable to DirectX 11, as they most likely just use all the DX11to12 compatibility layers to start with, they even mentioned a very mild performance increase and smoother frames times, as you see with most basic implementations of the low-level APIs. What I'm seeing is just a fairly big performance decrease and it feels extremely sluggish.

Oh well, luckily it can be turned off.

[Sesquashtoo 2,846]

4 minutes ago, David Mills said:

My card is fully DX12 capable and runs the sim beautifully at 4K when the default DX11 option is re-enabled. I lose about 10FPS when selecting the DX12 beta option.

When you turned off DX12, did you go back to at least SU6 performance?

[David Mills 4,774]

1 minute ago, Sesquashtoo said:

When you turned off DX12, did you go back to at least SU6 performance?

On Clear Skies, Yes, I got SU6 performance (with very preliminary testing). However, with significant cloud layers in the sky, I got less than SU6 performance even with DX11.

[Maxis 1,865]

Just now, David Mills said:

On Clear Skies, Yes, I got SU6 performance (with very preliminary testing). However, with significant cloud layers in the sky, I got less than SU6 performance even with DX11.

More involved weather .. more gpu demand... no free lunch.

[Nyxx 6,993]

Does this help with DX12?

https://forums.flightsimulator.com/t/couple-of-dx12-tips/470913/33

 

[Espana Pete 357]

5 minutes ago, Sethos said:

I had at the very least expected it to be comparable to DirectX 11, as they most likely just use all the DX11to12 compatibility layers to start with, they even mentioned a very mild performance increase and smoother frames times, as you see with most basic implementations of the low-level APIs. What I'm seeing is just a fairly big performance decrease and it feels extremely sluggish.

Oh well, luckily it can be turned off.

I read a review of the development video last night and am fairly sure MS said some systems could see a 10% reduction in FPS INITIALLY  which would in time lead to a 15% Increase. What wast clear was if the anticipated increase would be based on before or after the introduction of DX12. As you say, thankfully it can be turned off.

[enright 496]

From what I understand, they haven't optimized a single line of code for DX12 yet - and like most of the DX API updates, you typically only see improvements once you take advantage of some of the new features. I recall one of the Asobo team members mentioning that the purpose of including DX12 as an option in SU7 is merely a "hey, does this break things?" exercise that requires a large sample size of hardware (and some preliminary results are - YES! It does break some things). Once that's settled, they'll start pushing code that actually takes advantage of DX12 - and since they now have a baseline, they'll know whether the code is an improvement or not. 

[Sesquashtoo 2,846]

7 minutes ago, David Mills said:

On Clear Skies, Yes, I got SU6 performance (with very preliminary testing). However, with significant cloud layers in the sky, I got less than SU6 performance even with DX11.

Oh boy...thanks.....

[Maxis 1,865]

Not even sure why people are up in arms .. I do not think this was supposed to be anything more than the bare unoptimized implementation for now. Expectations were told to be set low and the results reflect that. 

[Bobsk8 12,754]

I am still updating things. Does DX 12 turn on automatically, I thought it was optional.?