Reducing physx value

Hi,

im using too much physics i guess and so my framerate is low:

iPhone Unity internal profiler stats:
cpu-player>    min: 68.1   max: 83.7   avg: 71.8
cpu-ogles-drv> min:  2.7   max:  5.5   avg:  3.2
cpu-present>   min:  1.1   max:  3.7   avg:  1.4
frametime>     min: 77.6   max: 94.4   avg: 82.0
draw-call #>   min:  17    max:  17    avg:  17     | batched:     4
tris #>        min:  4611  max:  4611  avg:  4611   | batched:   140
verts #>       min:  2850  max:  2850  avg:  2850   | batched:    96
player-detail> physx: 41.4 animation:  0.0 culling  0.8 skinning:  0.0 batching:  0.1 render:  5.1 fixed-update-count: 4 .. 5
mono-scripts>  update:  6.3   fixedUpdate: 14.4 coroutines:  0.1 
mono-memory>   used heap: 516096 allocated heap: 909312  max number of collections: 0 collection total duration:  0.0

But i need the physic. How could i lower the physx value?

Edit → Project Settings → Physics → Solver Iterations (this part is over in the Inspector)