Performance of rebinds after multiple changes?

[Steve Vestal]

The help pages say a rebind will happen automatically when things are 
added or removed to an OntModel (except odd cases).  I'm curious about 
the performance impact when a sequence of multiple changes are made.  Is 
the rebind itself fast, so a sequence of changes and rebinds has no 
significant performance impact until the next request for information?  
If not, would Model add(Statement[] statements) and Model 
remove(Statement[] statements) do a single rebind for a batch of changes?