VASP频率计算速度慢

Beginnerzck

大家好，我是做催化的，现在结构优化完了，准备做频率计算。我是直接用vaspkit生成的INCAR来计算，但是我发现，这个频率计算速度非常慢，大概300s一个电子步。各位大佬，请问这种速度对于频率计算是否正常？有无什么办法提高频率计算速度。（我听说频率计算不能用LREAL=A）
下面是INCAR，请各位大神指点一二：
Global Parameters
ISTART =  1            (Read existing wavefunction, if there)
ISPIN  =  1            (Non-Spin polarised DFT)
# ICHARG =  11         (Non-self-consistent: GGA/LDA band structures)
LREAL  = .FALSE.       (Projection operators: automatic)
# ENCUT  =  400        (Cut-off energy for plane wave basis set, in eV)
# PREC   =  Accurate   (Precision level: Normal or Accurate, set Accurate when perform structure lattice relaxation calculation)
LWAVE  = .TRUE.        (Write WAVECAR or not)
LCHARG = .TRUE.        (Write CHGCAR or not)
ADDGRID= .TRUE.        (Increase grid, helps GGA convergence)
# LVTOT  = .TRUE.      (Write total electrostatic potential into LOCPOT or not)
# LVHAR  = .TRUE.      (Write ionic + Hartree electrostatic potential into LOCPOT or not)
# NELECT =             (No. of electrons: charged cells, be careful)
# LPLANE = .TRUE.      (Real space distribution, supercells)
# NWRITE = 2           (Medium-level output)
# KPAR   = 2           (Divides k-grid into separate groups)
# NGXF    = 300        (FFT grid mesh density for nice charge/potential plots)
# NGYF    = 300        (FFT grid mesh density for nice charge/potential plots)
# NGZF    = 300        (FFT grid mesh density for nice charge/potential plots)

Frequence Calculations
NSW    =  1            (number of ionic steps. Make it odd.)
ISMEAR =  0            (gaussian smearing method)
SIGMA  =  0.05         (please check the width of the smearing)
IBRION =  5            (frequence calculation)
POTIM  =  0.02         (displacement step)
NFREE  =  2            (displacement freedom)