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I increased the limit in XF.php to 1G, and that let me open the template so I can see what's going on.  The template currently only has 900 lines, but at the bottom of the page there are 1200 rows of edit history, hence my guess that this XF bug is caused by edit history, especially with larger template files (as .less files tend to be).  

You need to add something that decreases the amount of history information shown on this page when it reaches a certain threshold, or paginate it, or something like that.