Hi,
yeah, in this table, evaluating the JS for the sorting, search, etc., and especially the ColumnFilterWidgets will take a couple moments.
The problem on the “Edit” screen is a different one: There, the high number of text input fields is a lot for the browser to manage, so that the browser will get slow. I do have some ideas to make this faster in the future, e.g. by only turning the actual/currently edited field in a text field, but that will still take some time.
Meanwhile, a possible work around could to do the actual editing of this table locally on your computer (e.g. in Excel), after exporting it from TablePress as a CSV file. Then, after making changes to that file, just re-import it into TablePress, choosing to replace the existing version.
Regards,
Tobias