the performance hasn’t made much improvement to the UI. i still get that slow performance.
If you launch your project after following the instructions, then you will be running in -DX12
So as I mentioned earlier, the amount of RAM you have is minimum required and is more than likely the cause of the issue. For example, the computers we test with have 32 GM of RAM which allows for much better in editor performance.
Also be sure your video card drivers and other drivers are all up to date. Aside from this, there is not much more I can offer as far as suggestions for getting rid of the stuttering.
Thank you,
Hi Andrew,
I have upgraded to 16GB 3200mhz RAM and it is still running slow. However, I have found out why the UI was running very slow from this post: Slow UI with UE 4.9.2 - AnswerHub - Unreal Engine Forums. UE 4.9 and 4.10 both require me to close the EVGA PrecisionX GPU Driver and clear windows 10 notifications. Please could you make a patch or update in the future like 4.11+ so UE4 is compatible with the Driver. its just that if i keep closing down EVGA Precision X it will make my GPU hot and the GPU fans don’t start until the temperature goes above 60 degrees celsius so it doesn’t keep my system cool.
Thanks,
Iby
Unfortunately this isn’t something we can control on our ends, as it has to do with EVGA and Windows 10 patching. Driver compatibility is changed to support 3d applications and not the other way around usually. I used to use EVGA Precision X, and your card should not be solely functioning well without that app. I would look at getting your card to the default settings without the Precision X application so it doesn’t overheat or malfunction.
Ah right Thank you. I have now sent an email to EVGA support. Also my GTX 970 is designed by default where the fans do not start until 60 degrees. That is its default setting without the PrecisionX software. I have to change the fan speed in Precision X to keep it cool.
Perhaps there is another software program that can help you control your fan speeds that won’t have conflict with the editor. Do be careful when looking at alternate programs that are not native to your graphics card.
By the way, for those who are having problems. I have a 1080GTX and the GUI was running incredibly slow. When it was displaying the mesh, either static or skeletal it worked fine in the view port, but only if it was docked in the main panel. It was so crazy slow I couldn’t work. I was kicking myself that my 1080GTX would scream, but it was dog slow.
Solution:
I added the switch -DX12 to my executable: UE4Editor, and now it’s amazing.
Ananda
Closing via Task manager or uninstalling PrecisionX and other EVGA software fixed the slow UI issue for me. I checked with EVGA they said the software is designed for gaming not for development as overclocking causes problems when developing. I then eventually stumbled on this list of software conflicts with UE4 and PrecisionX is on the list: A new, community-hosted Unreal Engine Wiki - Announcements - Unreal Engine Forums
Also just wondering doesn’t UE 4.12 and 4.13 already use DX12 by default?
I have been working with 3 or 4 monitors for a very long time and just recently windows 10 updated (not sure if this was the cause or not) when this started happening. It drops below 10fps and unreal becomes unusable, the interface lags really badly.
If I type stat gpu in the editor it says Slate UI is taking anything between 20-200ms but as soon as I close all the extra windows and just have the main window it drops to 0.6ms.
I understand there is going to be some performance impact having more than one window open but it shouldn’t be this huge and never used to be a problem.
I’ve tried everything to fix this (including -DX12) but nothing helps, did anyone here solve the issue? It’s going to affect my productivity massively if I can’t fix it 
Did you Upgrade to windows 10 or did you do a clean install? I did a clean install and Windows 10 was running much better when it doesn’t have the old windows data. Does it still lag with just 2 monitors connected? Also what is your PC Spec? Which type of gpu? Are you using SLI? Also try checking for software conflict. I have an EVGA gpu and PrecisionX driver was causing me problems and the same with ASUS Sonic Suite 2 driver so i close them down or uninstall before opening up UE4.
Originally I had upgraded from win 7 but over the past few days of trying to fix this I have completely re formatted and now have a fresh install of windows with all the latest drivers and updates. There shouldn’t be any conflicts as all I have on my PC is unreal engine and iTunes lol. Also tried doing a clean boot so pretty sure it’s not that.
PC spec is:
i7 4770k
16gb ram
gtx 1080 x1
500gb ssd
Just tried unplugging all monitors apart from 1 and it makes no difference, as soon as I open more than one window it lags like crazy
I forgot to ask, what engine version are you using? I’m not 100% sure and haven’t researched thoroughly but I have heard some CPUs might not be compatible with DX12. i think the latest version of UE4 uses DX12 by default. Try using “-DX11” or maybe try installing older version of UE4 like 4.7 where DX12 hasn’t been implemented. I don’t mean to sound annoying but have u tried with absolutely no drivers installed except the latest Nvidia Geforce Experience Drivers?
I’m using 4.17.2, Also tried in a blank project in 4.18.2 and it’s exactly the same. Just tried DX11 and no difference. Right now all I have installed is unreal engine and the latest geforce drivers.
I’m also having same issue…
geforce 1080ti,
32 gig ddr4 3200mhz,
i7-7700K at 4.7,
Running off 960 Evo
Latest Windows 10 and all drivers and bios…
-DX12 makes no difference…
1 screen.
Hi,
I can’t switch to DX12 because it crashes on startup
Fatal error: [File:E:\UE4\UnrealEngine\Engine\Source\Runtime\D3D12RHI\Private\D3D12Util.cpp] [Line: 242] (Device->*TPSOFunctionMap<TDesc>::GetCreatePipelineState())(Desc, IID_PPV_ARGS(&PSO)) failed at E:\UE4\UnrealEngine\Engine\Source\Runtime\D3D12RHI\Private\Windows\WindowsD3D12PipelineState.cpp:582 with error E_INVAL
any ideas?
thanks
In the same boat now… Pretty sure it started for me around 4.18.2…but it could have been a MSFT Win10 update…
Hi guys, by enabling this option ( use less CPU when in background (its enable by default)) i think your problem will be solve. ahhhhh, at least it worked for me. tested in 4.18.2. if this is a bug please report
already reported in the forums: nope that doesn’t work for me