if its crashing then you should go to the number format settings and change the "," to a "." in the decimal options. To get to the number format settings just go to region settings > formats > advanced/more settings > numbers.
But if its just rendering slow then try the resampler patcher found here
link. It will speed up rendering.
If none of these work/are the issues you're having, then please try and give us more information on the issues you're having.