
there is always someone to help... thx.
i downloaded the last release candidate version (2.57) and the problem with the diferent size emiters is solved with the "sampling_rate" parameter..



sampling_rate = 1 for big emiters
sampling_rate = 600 for small emiters (im not really sure about this value, i just used that number because the size diference of the emiters is 600x in area)
i think with this change the render time will lower a lot. i will render to see.