Tooltip efficiency

Tooltip efficiency

I have a page with a fairly large table (~2500 rows x 15 columns).  The cells in four of those columns can display tooltips if they contain data, but the tooltip setup is the same for all of them.  Because this appears in an internal application that is restricted to IE8, the processing on this is pretty slow.  Is it more efficient to create one tooltip using the table id as the selector or would I be better off creating individual tooltips for each cell that needs one?