Multiple touches per frame

Is it possible to get more than one touch positions per frame from the same finger? I don't mean multitouch, but more positions from the same finger during a frame.

Problem that I have is that I'm making a line drawing app.. Creating a new line takes some time (especially on cheaper Android hardware) so the framerate drops. I'm already creating a new line at the end of the previous, but when I draw 2 lines shortly after each other I still suffer from low framerates. On cheaper hardware it gets so bad that a circle becomes a triangle. Even a bezier curve won't fix this

Anybody knows a solution to get the intermediate touches. I already tried OnGui but also that gives me only one position per frame. Any other way to get some more positions?

 

Unity only calculates the touch positions one per frame.
Maybe you can write a native plugin that sample the native touches more often than unity.
Even if that's possible I'm not sure if you can update the value more then one a frame from inside of unity.