how much can it take?

[needforhint]

I did a program with wich you can stress irrlicht shadering capability, the shader all the nodes care is target 2.0 direction per pixel light with specularity at bump map (the shader maps all 2 texture layers), the model is skinned animated X mesh, the shader is quite heavy (2.0).
You place models with right CTRL and unplace with SHIFT, scroll with mouse to move the node attached to camera away/closer to yourself
here: http://www.medeal.sk/irr/shaderstress.zip