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Slow convergence of structural optimization

Amir Nasser Shamkhali
amir_n_shamkhali@yahoo.com

Dear Firefly users
I'm working on optimization of a complex of Zn with porphyrin ligand. After one week and using 4 processors and 40 optimization steps, the RMS of gradients can not be lower than 298 and the calculation continues yet. What can I do for faster convergence of optimization process?
Thanks for your attention.

My input keywords is as follows:
$CONTRL scftyp=RHF runtyp=optimize icharg=0 mult=1
coord=zmt NZVAR=402 dfttyp=B3LYP MAXIT=100 UNITS=ANGS $END
$SYSTEM mklnp=4 TIMLIM=1000000 memory=60000000 $END
$SMP call64=.T. $END
$GUESS  GUESS=HUCKEL   $END
$statpt nstep=200 $end
$ZMAT  DLC=1 Auto=1 $end
$BASIS  GBASIS=TZV POLAR=HONDO7 $END

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