hiding lots of columns takes a long time

Steps to Reproduce

1. load the attached file
2. click a column header to hide 390 columns

Current Result

it takes over 2 mins

Expected Result

reduced to several seconds

Debug Information

1. DependencyTableEx.getEvaluatedDependents() consumes most of the time
2. Notifying content change when hiding columns takes lots of time, normally it's unnecessary for most cases. Since hidden columns don't change their content. Maybe we should notify only for specific cases e.g. when enabling this option: a chart that doesn't show data from hidden rows/columns