Potentially seeing through walls: a performance issue

[plutomaniac]

I reconstructed one of the largest map in my mod. Imagine the frustration.
Sill, performance issues started to arise, even without objects placed...

Might it be related to textures?

How big are your maps? Maybe your graphics card is not strong enough. Even without objects and stuff it lags? Maybe a custom wall or model does that. Sometimes I notice lags when using some converted models that generate lots of bad normal and errors at HPL.log. But that's because I add objects.