[2020] Textures look terrible with "advanced shaders" turned off

I frankly don't know if what you see there is expected or not on your video system, although of course you would expect lower graphics quality with that option off. On my nVidia 1060 it looks somewhat similar but I'd say better than you see.

With the fps thing, is it just the higher fps number you are after? Or does it make for better general performance too?  

joriarty said: 'd expect the shaders to affect the appearance of water and perhaps add some nice lighting effects, and if that's all they did then I'd probably turn them off for the framerate boost. However, the odd behaviour with the textures makes it seem like a bug. It really looks like the textures are stuck on an ultra low quality setting (i.e. one that's not toggle-able in the UI) when the advanced shaders are turned off.

I can't say one way or the other really, all this is out of my area of expertise to be honest.

If you feel it's a bug then I guess the Bug Reports forum would be your best next step.