Unity Game Preview Lagging With DirectX 11

Question

I've recently built a new PC and after trying to use Unity for the first time, I opened a project which worked perfectly on my old PC, but now on this new one the game preview stutters. I've got basically an empty scene with a capsule that moves when holding down a key. It used to move perfectly smooth but now it's lagging the entire time.

I've noticed that when I start unity with the -force-opengl command line argument it works fine, but I can't help feeling this is just sidestepping a larger problem and I'd rather sort out the actual problem itself instead of working around it. Could any of you help out with this? Thanks in advance!

**Edit

Turns out it's DirectX 11 causing the problem, I went into the Project Settings > Player Settings and switched from DX11 to DX9 and it works perfectly... I still have no idea why it's not happy with DX11 though, so any help with that would be appreciated!

Answer 1

Answer by x4000 · Jan 26, 2017 at 05:38 PM

Figured I would throw in my two cents that this has also been a problem for me, on four different computers, on Windows 7 and Windows 10, from Unity 4.x to now Unity 5.5.

Not only do I get strange visual glitches, but also enormous amounts of lag. Only in the editor: running anything else under the sun, including standalone unity games, works great.

For a couple of years I figured it was something on my computer, then I upgraded computers... and then upgraded again... and installed on a second computer to check it again... no dice. All nVidia cards, three were laptops and one was not. Current problem is on windows 10 with a 1080 on latest drivers, so it's no slouch.

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BallistiX09 · Feb 06, 2017 at 10:31 PM 0

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It's strange that this still hasn't been fixed, I've noticed a few other people with the same problem and there still doesn't seem to be any consistent cause or any way to fix it. Here's hoping it's somehow fixed in a future patch! I'm beginning to think it might not only be a Unity problem though, I'm getting almost exactly the same type of lag in 3DS Max, even though I only have a basic scene open. This only seems to happen when I have all four viewports visible at once, and stops happening when I maximise a viewport. Not sure if you're getting the same problem in that, would be interesting to find out though!

x4000 BallistiX09 · Feb 07, 2017 at 12:45 AM 0

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For me it's just all the time, immediately, as soon as I log into Unity. I don't use Maya (my artist does), but in my brief usage of it I never had any problems. Sketchup, Vue, Photoshop, and similar all perform great for me. Unity is literally the only program I've had unexpected lag on, and it's been on 3+ computers now. :/ Only DX11.

Hopefully it will be moot with Vulkan, but I have not tested that yet.

Answer 2

Answer by Raditz_X_RAG3 · Jun 22, 2016 at 05:07 PM

After weeks of struggling with this I found something that fixed my problem. After installing a completely different program called SyncToy by Microsoft, the DirectX 11 related lag went away. The reason I think this happened, is because I also installed the .NET 2.0 framework with it. Just install the framework here and it should fix it.

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BallistiX09 · Jun 22, 2016 at 06:01 PM 0

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I just tried installing both the framework, and the SyncToy program you mentioned, but sadly I'm still getting the lag :\ Is there anything else you done around the same time which might have fixed it? Either way, glad to hear it's fixed for you though!

Raditz_X_RAG3 · Jun 22, 2016 at 06:08 PM 0

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Well I reinstalled Unity several times, so you could try a reinstall.

BallistiX09 Raditz_X_RAG3 · Jun 22, 2016 at 06:27 PM 0

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That's a good point actually, I've not tried that yet! I'll give it a go, thanks!

Answer 3

Answer by trintasegundos · Oct 31, 2016 at 02:40 PM

i have the same problem, any news abour reinstall unity? i have directx 11 in win10

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BallistiX09 · Oct 31, 2016 at 07:16 PM 0

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Heyyy! Sorry, I've tried completely uninstalling, then reinstalling with the latest version, but I still haven't been able to fix it

Answer 4

Answer by astracat111 · Mar 11, 2018 at 04:04 PM

I'm gonna get hated for saying this, but I've been experiencing the same lag so I'm switching to using OpenGL GLES 3.0 on all platforms, from android to mac to windows.

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Unity Game Preview Lagging With DirectX 11

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