Should I use object or ref object?

[treeform]

I use refs almost everywhere. I only use nonrefs if it's a some type like 
vector, color, calendar. If it does not contain pointers to other objects, 
string, seq etc... I try to use nonrefs objects when they are part of a large 
seq. If you want speed, always profile your code with something like VTune to 
see if ref or nonrefs are faster. Performance is always surpriseing!