rtf - Very slow interop with Word in c# application -

i use vs2005 , need create many .doc files. computer(intel c2d6600 2gb ram) can convert 10 files/minute slow me. should improve perfomance?

my code:

 oword = new word.application(); omissing = system.reflection.missing.value; odoc = this._oword.documents.add(ref omissing, ref omissing, ref omissing, ref omissing);  ... //do ...  //save rtf object filename = this.filertf; object fileformat = word.wdsaveformat.wdformatrtf; object savechanges = false; odoc.saveas(ref filename, ref fileformat, ref omissing, ref omissing, ref omissing, ref omissing, ref omissing, ref omissing, ref omissing, ref omissing, ref omissing, ref omissing, ref omissing, ref omissing, ref omissing, ref omissing); oword.quit(ref savechanges, ref omissing, ref omissing); 

my psychic debugging powers tell me need optimize below code:

... //do ...