Frame rate loss when rendering outdoor areas in njma01.wad

[Sussudio]

This doesn't happen with ZDoom, so I'm curious about why it happens and if it can be prevented somehow. Running the latest SVN build here.

[Graf Zahl]

What graphics card and CPU? I don't get any slowdown.

The problem is most likely caused by the skybox which uses a line_horizon special to extend the sky into infinity. To handle this some tricks are necessary that may stall older hardware.

[Sussudio]

256mb GeForce 6600 and 3.4ghz Intel Pentium 4.

[Sussudio]

I just figured out which option was causing the slowdown; anisotropic filtering (16x)

Disabling it allows outdoor areas to be played at full speed.

[Graf Zahl]

Try 4x or 8x. I never had problems with those on a GF 6800.