QPainter draw methods are highly performance sensitive operations, and it can be the case that users want to draw data that is already structured in a continuous numpy array. Instead of creating numpy specific draw methods (such as drawPointsNp) instead we can use the pointer based methods that are already in the C++ API. In this case it would go something along the lines of. size = 10_000 # number of lines memory = np.empty((size, 4), dtype=np.float64) lines = shiboken6.wrapInstance(memory.ctypes.data, QtCore.QLineF) rng = np.random.default_rng() x = rng.random(size) * size y = rng.random(size) * size arr = np.empty((size, 4), dtype=np.float64) arr[:, 0] = x # x coordinates arr[:, 1] = y # y coordinates arr[:, 2] = x + 2 arr[:, 3] = y + 2 memory[:] = arr qimg = QtGui.QImage(1_024, 1_024, QtGui.QImage.Format.Format_RGB32) qimg.fill(QtCore.Qt.GlobalColor.transparent) painter = QtGui.QPainter(qimg) painter.setPen(QtCore.Qt.GlobalColor.cyan) painter.drawLines(lines, size) painter.end() This method was tested against QPainter.drawPointsNp and was found to outperform it by a significant margin. This commit exposes the following method signatures QPainter.drawPoints(const QPointF*,int) QPainter.drawLines(const QLineF*, int) QPainter.drawRects(const QRectF*, int) Pick-to: 6.4 Fixes: PYSIDE-1924 Change-Id: I844a7bc5fec33673b47228896cb63e4245552a94 Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org> Reviewed-by: Shyamnath Premnadh <Shyamnath.Premnadh@qt.io>