It is hard to decipher what you mean. As a rule: you can spare some time by optimizing with reduced k-points grid and cutoff, increase them later P. -- Paolo Giannozzi, Dept of Chemistry&Physics&Environment, Univ. Udine, via delle Scienze 208, 33100 Udine, Italy Phone +39-0432-558216, fax +39-0432-558222