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When loading any assembly that requires gdiplus, mono hangs for up to 20 seconds, while fontconfig builds its caches. This can be tested by building the attached solution and running on a clean VM. I tested against 10.9, but I suspect that it will occur on other versions of osx. It needs to be a clean install or else your machine will have the caches already and not hang.
I seem to recall that this didn't occur on earlier versions of mono.
Created attachment 5570 [details]
solution that hangs on a clean vm install.
I have found references to this issue going back several years:
To be clear, if you do the fix suggested in the first post (changing the fontconfig path), it causes the second issue of the system hanging for 1:30 on first load.