Very slow interop with Word in c# application

I use VS2005 and I need to create many .doc files. My computer(Intel c2d6600 with 2gb RAM) can convert with 10 files/minute it is very slow for me. What should I do to 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 something
...

//save rtf
object fileName = this.FileRtf;
object fileFormat = Word.WdSaveFormat.wdFormatRTF;
object savechanges = false;
oDoc.SaveAs(ref fileNa开发者_开发技巧me, 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 that you need to optimize the below code:

...
//Do something
...

---

Try to reduce number of calls to

oWord = new Word.Application(); 
//and 
oWord.Quit(ref savechanges, ref oMissing, ref oMissing); 

In other words call them once and use one instance of Word for multiple files.

---

First, you should profile your application to find out, where the time is spent.

For is list of profilers, see this SO question.