Hi there, FYI, I've just added a new code example on multi_type_vector to when to use position hints: http://kohei.us/files/mdds/doc/multi_type_vector.html#use-of-position-hint-to-avoid-expensive-block-position-lookup The concept of position hints may be a bit hard to understand if you are not used to it, but it *is* used all over Calc core. So, it's a good idea to get to know it a little. Best, Kohei