DRD Team

As in the topic, this problem happens only when I use a 64bit version of GZDoom, being it a stable or dev release.
When the rendering interpolation is turned on the 32bit version, the framerate is on the same level like the monitor refreshing rate.
However with the 64bit version and the same option turned on, it's always a twice lower framerate than a monitor's refreshing rate - fe. when my monitor has got a 75Hz refreshing rate, my FPS cap won't be ever higher than 37FPS.

This sounds like a driver bug. I had similar problems with this until approx. 8-10 months ago when this got fixed by a driver update.

What kind of graphics card are you using?

Geforce GTX 660, will try with the newest driver.

Which one are you currently using? Like I said, I had the same problem with some older revisions. I am also using NVidia.

Ok, updated to the newest drivers, didn't make any changes at all in the 64bit version, framerate still locked at 37FPS.
My drivers are 341.95

Just for comparison

My system specs:


Currently, I use GZD g2.2pre-1651 x64 with these settings in an autoexec.cfg file:

• vid_fps 1
  vid_vsync 0
  cl_capfps 0

Playing Enjay's GENE_TECH I get a framerate of 480 fps on average



Using these settings

• vid_fps 1
  vid_vsync 1
  cl_capfps 1

the framerate drops to ca 37 fps



Considering the CPU, I guess that is acceptable.

Of course it drops to around 35 fps if you disable uncapped frame rate. That has nothing to do with your graphics hardware or CPU.

What this report was about is that the 64 bit version is slower than the 32 bit version (and that is all driver overhead, because I once experienced the same thing.)

Same here with debian 2.1.1 builds, and also the OSX port (version 0.5.9)

I've always played at solid 60fps, and now I won't get any more than 35 fps.

I found a .deb package of 2.0.1 version in dpkg.com, for Ubuntu Trusty, and it actually ran at 60 fps. (minus glitchy textures, but that was sector corruption in the wad I think)

I checked in 4chan /doom/ thread with this issue and they told me about this OpenGL 4/ OpenGL 2 version distinction.

So I tried the drdteam deb build for 1.9.1 amd64, and I'm still stuck at 35 fps.

Is this really a 64-bit-only issue?

elgambitero wrote:Same here with debian 2.1.1 builds, and also the OSX port (version 0.5.9)

I've always played at solid 60fps, and now I won't get any more than 35 fps.

I found a .deb package of 2.0.1 version in dpkg.com, for Ubuntu Trusty, and it actually ran at 60 fps. (minus glitchy textures, but that was sector corruption in the wad I think)

Well, I just found that if I turn on "rendering interpolation" it jumps up to 60fps, dropping to 44 in heavy actor presence, and 30 with heavy actor and effects presence (I test using project brutality)

At this point, I think it's really the limit of my laptop.


So! As some people in /doom/ told me, If the OpenGL implementation installed on the OS is 3.0, and GZDooM 2.1.1 runs on 4.0, you lose GPU acceleration on OpenGL 4.0 features. What the system does, is making those calculations in the CPU, rather than the GPU, so you ed up with framerate drops.

This solves the issue for me, but maybe the 64-bit incongruences may be still present. Not in 1.9.1 though, I'm using 1.9.1 amd64