Godot: GTX 950 has 2-3 second delay on previewing scenes (windows)

Created on 8 Oct 2017 · 12Comments · Source: godotengine/godot

Operating system or device, Godot version, GPU Model and driver (if graphics related):
2.1.4

Issue description:
Okay, so my old github issue was here, however, Reddit was wrong. I was wrong.

There is a bug with the GTX 950 with Godot on Windows. I have proof. It's not about memory bandwidth whatsoever.

Check this out:
https://www.youtube.com/watch?v=m79rB3TnkTY

He previews scenes instantly and I asked what his specs were, he replied:

AMD Phenom(tm) II X4 955 Processor × 4
GeForce GTS 250

A GTS 250 has far less memory bandwidth than a GTX 950

Also, this user posted an issue in the discord help channel, of this video: https://cdn.discordapp.com/attachments/342056330523049988/366511629501857792/2017-10-08_11-03-41.mkv

His scene previewing is instant. So I pm'd him and asked what his specs are, he replied with:

Hi, i use Ubuntu 16.04, Intel® Core™ i5-4440 CPU @ 3.10GHz × 4 , Intel® Haswell Desktop

Asked if he wasing the integrated graphics card, he said yes.

Conclusion

It doesn't make sense that an integrated graphics card has instant previews compared to a dedicated graphic card like the GTX 950. And also the GTS 250 is 70 GB/s compared to the 90 GB/s GTX 950 and still has instant previews. It has to be a Windows issue with the GTX 950

archived bug rendering

Source

ghost

Most helpful comment

UPDATE: This is not just GTX. I tested again an empty project by paying more attention, and I realized that I DO HAVE a white frozen window too, which lasts for 1 second, even if the scene just contains one Node2D.
I realize this now, because as @Dillybob92 linked the video of someone on Linux, they can launch their game instantly with no startup lag AND NO WHITE SCREEN LASTING 1 SECOND (pay attention to the detail :p)
Would be nice to nail this down!

Zylann on 8 Oct 2017

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All 12 comments

This issue remembers me of #10980, in which I also mentionned a startup lag in 2.1.4.

Did you test in 2.1.3?

Zylann on 8 Oct 2017

@Zylann Yes sir, even did 2.1.2 and 3.0

What was your GPU?

ghost on 8 Oct 2017

I have a nVidia GeForce 940M, so maybe this issue isn't about the GPU, but the debugger? Did you see this lag not happen in another Windows machine?

Edit: take a look at https://github.com/godotengine/godot/issues/10980, I tried something and the lag went away (EDIT: read what comes next, there actually IS another lag)

Zylann on 8 Oct 2017

If using a different card on Windows (rx 480 or an AMD 7870 for example), it doesn't lag. So definitely nVidia issue here on Windows ONLY

Because that guy in my op is using Linux with the GTS 250 and no delay. I bet if you tried Godot on Linux with your 940M there will be no delay.

So. Windows+Nvidia issue only. Now, how do I go about troubleshooting this to give more information? No errors are in the console whatsoever when this happens?

ghost on 8 Oct 2017

I'm not sure, I would put prints in the engine in many places to find the culprit maybe

Zylann on 8 Oct 2017

👍2

Yeah, GTX is basically nvidia right? So this is definitely a nvidia+windows ONLY issue. Looks like it happens on the 940M, and GTX 950 and probably countless more. @reduz and more lower level developers are our only hope

ghost on 8 Oct 2017

@groud this also happens in 3.0. For me it opens a white window, freezes 1 second, then shows the Godot splash logo for 0.2 seconds and then the game starts.

Zylann on 8 Oct 2017

👍1

yeah, I get this in Windows 7 64bit with GeForce 760 GTX running Godot 3.0, can't remember if it's the same with 2.x, although I recall it varying between game runs.

sketchyfun on 9 Oct 2017

I remember having read something about the nvidia driver parsing some lists of profiles on initialization ... so if that is the case, then probably this can't be fixed in godot that easily ...

Here is something I found when searching for where I might have read that https://hero.handmade.network/forums/code-discussion/t/2503-%5Bday_235%5D_opengls_pixel_format_takes_a_long_time#12672
The numbers seem pretty similar (ca. 3 seconds) and it seems to be a Windows NVidia only thing ...
There also seems to be a workaround involving replacing files read by the driver with smaller ones from older versions ... I mostly use Linux and not Windows so I can't try and confirm it if that really works right now ...

x1212 on 9 Oct 2017

Same here with Godot 3.0 and Windows 10. I have a GeForce GTX 980.
With linux and the same CG card I don't have this issue (proprietary drivers).

Nutriz on 21 Oct 2017

Bug triage note: The original issue reporter closed all their issues before deleting their account. If you are affected by a similar issue/want a similar feature, please file a new ticket (referencing this one if it contains useful information) so that it can be further looked at and eventually resolved.