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QT 5.13 on OS X 10.12 -- spinning ball of death

  • I have a relatively simple QT app that loads data from a file and displays it using qtcustom plot. Under linux it performs great. When compiled under OS X almost any GUI action -- open a file, close the application, click on a graph brings up the OS X spin ball. I'm really not sure how to start diagnosing the root cause.

  • Lifetime Qt Champion

    Hi and welcome to the forums.
    First, i would try one of Qts examples to see if they also run very slowly
    as to know if to look for CustomPlot issues or it's of a more general nature.
    Also check you are using the right XCode.
    Target Platform Architecture Build Environment
    macOS 10.12, 10.13, 10.14 x86_64 and x86_64h Xcode 10 (10.14 SDK), Xcode 9* (10.13 SDK)

  • @mrjj

    Thanks for your help. I followed your lead -- the qt examples were fine as were the qcustomplot examples. However, I finally traced the issue to the settings of the pixel buffer ratio. One line of code resolved all the problems


    It seems the default (2.0) causes drawing large graphs to go very very slowly.


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