RC 18 laggy with large blocks of text

There is extreme lagging when clicking on text entries that have thousands of lines (e.g., one text block has 5615 lines–I have a number of text files like that and it seems to be exclusively when I click on those that there is a problem with freezing, lagging, etc.). The project is comprised only of text, nothing else; the project is only 4 MB. All other release candidates did not show this laggy behavior.