How to reduce star/kinetics computation time

vigorzxy

Now I use star/kinetics module to simulate the diesel (n-heptane mechanism used,44 species and 150 reactions) HCCI combustion process, but it is extremely CPU intensive. Therefore, I want to perform the coupled chemical/turbulent simulation only in a specified time-step range. I tried the keyword "DTSTRT", but it doesn¡¯t work for this purpose. How should I do or is there any other method to reduce the computation time, excepting parellel computation?

Thanks a lot!