Mothur cluster.split help.

I am using mothur pipeline for analysis of my 16S data. I have a large dataset due to which each command takes lot of time to run. Currently I am performing clustering of OTUs by using cluster.split command but it is taking too much time and I am pretty sure that soon server will give me an error “command took too long to run” and will shut it down. I am in dire need gor this data to get analyzed and it would be of great help if there is any way for cluster.split to run and complete without shutting down due to too much time. I have already performed all of the prefiltering steps to remove excess reads and cannot decrease size of my data anymore. Kindly help me in this regard I will be very much thankful to you. My user account is given below:
Best regards,
Faizan Saleem