First of all really spectacular library with great functions. I'm using QCP in an qml application, where I inherit the QCP-Widget inside a QQuickItem which works really great. Performance of real time plots are really okay. The application has to be multi platform. On Windows and low dpi android tablets, the lines and fonts of QCP are really sharp and look good. On Android and IOS the fonts and the lines are looking blurry. I experimented with different approaches, that were already mentioned in the forum.
Here is a screenshot of the android verion on a 4K display (HTC U11): https://imgur.com/a/rALAeon
Does anyone has a tip regarding this behaviour? I'm not really familiar with coding in Qts painting API