I have a new computer and I was asking myself....

[Feuerfalke]

True. But I said these are the best settings working for me.

Forests=3 add an additional forest-layer that causes a drop in fps with barely any visual difference at all. It even does not make the forest more visible from the sides, where I'd really like to see some more details

Water=4 causes artifacts on my machine

Effects=2 causes pink FlaK-Puffs and flickering 3D-smoke

Specular=3 has no effect, as there is only 0,1,2 supported to my knowledge, but I'd be glad if you can show me a link that defines the difference.