@L--U--P--U--S it pretty much points to the same thing, the slowdowns happen when you turn on auto margin things.

Line number margins are set by Geany to fit the line numbers in a Scintilla callback IIRC, so its after Scintilla has loaded and done its thing, which may have included laying out at least some of the file, so that layout has to be done again after the margin is set since that changes the available page width, and that re-layout is the extra time you see. Not sure how we can fix that since it is different for each file because it depends on the number of lines in each file and so can't be set until the file is loaded.

The marker margins is the one automated by the patch identified by @andy5995 and it probably also causes a Scintilla re-layout when its set to anything other than Scintillas default value (16 I think). Hopefully @b4n can identify a way of setting it before load since its the same for all files.

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