Reducing the time to complete each CRUN

Hello CMS

I am getting ready to submit 20-years-long production runs and I am looking at ways to reduce my CRUN length (6h). Currently for a 650X650 domain (1.5 km res), it takes about 20 min to complete each CRUN for the Nested Domain, which means almost 2h for a 36h forecast. What ways can I look at to try and optimize this? Will reducing STASH variables impact CRUN time?

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