Do you really consider 250 MB - 300 MB as a ridiculously large file for 2017?

For a source code file, it's very large. Even auto-generated source code would rarely (if ever) get that large. Not that it's a use case that shouldn't be supported if possible. If the machine can handle it and you're patient enough, then the only limit should be the size of a signed integer (usually 2^32) minus one.

@codebrainz keep_edit_history_on_reload is currently ticked.

If you're Reloading the file (either by the menu, toolbar or Ctrl+r), then each time it will duplicate the entire file contents into memory. For example if you reload a 300MB file, it will put all 300MB into the undo buffer, plus whatever the new contents are will be resident in the buffer. If you reload it a second time, the undo buffer will contain 600MB of data, and so on. That's why I mentioned it.

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