[MacPorts] #56915: Qgis3 port is very slow and unresponsive

[MacPorts]

#56915: Qgis3 port is very slow and unresponsive
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  Reporter:  Malauch  |      Owner:  Veence
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:  qgis3, qt5, qt59
      Port:  qgis3    |
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Comment (by Malauch):

 It's easiest to spot the difference in speed when adding very quickly new
 points to point layer. With QT 5.9 all points shows immediately on canvas,
 with QT 5.10 it's shows with a lot of lag. Naturally it's just a test to
 show a problem, not a real task. However when editing medium or large
 project that lag is visible and very annoying when panning the canvas,
 zoom in, zoom out. Sometimes when panning, some part of map is blank for
 1-2 seconds (all layers are local files with vectors).

 I'm curious about how it works with QT 5.11 but it's not on a macports
 yet.

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Ticket URL: <https://trac.macports.org/ticket/56915#comment:3>
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