Github user theburge commented on the issue:

    https://github.com/apache/couchdb-couch/pull/185
  
    Thanks for doing the additional investigation @jaydoane. I'm glad the 
performance remains consistently improved.
    
    From memory, I've observed deeply buried headers frequently in MT, although 
admittedly not lots at once (usually a DB or two). However, they're not only on 
.meta files if memory serves, but also on view files (and I'm fairly sure on 
primary database files, although IIRC usually in correlation with some other 
odd behaviour -- so perhaps it shouldn't be considered _normal_ but it's 
certainly possible).
    
    In any case, it's reassuring that the vectored approach is only tried if 
the basic approach fails, given the striking difference in page-in rate.


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