I fetched quickplot from svn to try to test your issues with cairo. I ran apt-get build-dep quickplot, then tried to build.
win.c:43:29: fatal error: imgGrabCursor.xpm: No such file or directory #include "imgGrabCursor.xpm" ^ compilation terminated. I don't know the nature of your issues with Cairo but I have some significant experience drawing waveforms with both in-memory code (using pixel-level macros) and using Cairo, and have not found Cairo to be slow if you're using a sensible algorithm to draw the waveform.
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