I am a beginner using VASP to do material modeling. I have made a heterostructure model written in the form of a POSCAR file. But the supercell is too big (it contains 60 atoms) so that the computational speed is slow (unreasonably slow) even I put it into the cluster. How can I make an effective INCAR setting to do the calculation in structure relaxation and self-consistent calculation process?
Two things are important for the computational speed for VASP users. The first thing is ENCUT, which is controlled by the INCAR file. For a quick calculation, you can pick up this value just by referring to the ENMAX values of your POTCAR file. The other thing is the k sampling, which is decided by KPOINTS file. For your system with 60 atoms, I guess your $a$ and $b$ are very large and hence you can use lesser points for your simulations. For convenience, you can utilize the VASPKIT tool to automatically generate KPOINTS file with low/medium KP-resolved values for a quick calculation.