After a brew update I run two days ago, converting a svg to png with imagemagick takes approximately 15 minutes, where my ubuntu install does the same conversion in less than 2 seconds.
when using -debug all, I see draw.c is using a lot of cpu time, whereas ubuntu seems to delegate it to something else, which takes no time rendering the input image
macOS high sierra 10.13.4,
Things that did not work:
-force reinstall and force rebuilding imagemagick from source
-rebuilding font caches via a reinstall of fontconfig
-Complete removal of homebrew, and reinstall everything from scratch