Thank you very much! The attachment is the relevant document. If it is not because of the calcium-silicon system, it may be because of my in.file settings. On my cluster, 1gpu+1cpu: 0.58ns/d; 16cpu: 1.13ns/d.
In addition, I would like to ask about fix reax/c/bonds, how to modify cutoff to control the generation of bonds.
I don't see any attachment, can you send again?