Is number of stored fields affects query performance?

[Evgeniy Strokin]

I have two questions related to the subject:
 
1. If I have 100 fields in my document, all indexed. Will my queries run slower 
if I store all 100 fields or just 10?
 
2. If I have 100 fields in my documents, all stored. Will my queries run slower 
if I index all 100 fields or just 10?
 
Thanks in advance,
Eugene