Frozen / extremely slow when handling a 300-row table

Well, yes. I can see how the first row on a table (or the first column, or both) can be a fixed Relation for a series of objects in a table, and how it can be useful to create a set of objects from a table. But while useful, that’s a more “advanced” feature, while currently the implementation of tables is still missing basic features. Like being able to work past 25 rows. Or being able to merge two adjacent cells. Or allowing basic formatting in the cells. These things have been pointed out a year ago (see here and here).