[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:  (none)
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:
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 Since qgis3 port verions 3.0 I noticed that it is very unresponsive. I
 even created the ticket in the past:
 https://trac.macports.org/ticket/56169 However, official binaries works
 fast. Today I found the time to make some experiments and try to compile
 qgis3 port with qt59. Now I can confirm that this is a culprint for
 slowing down of qgis3 port. Additionaly qt59 fixes other problem with no
 option to resize modal windows: https://trac.macports.org/ticket/56911.
 Naturally it also introduce some new bugs like huge mouse cursors (for
 addint new features and etc.).

 For now running qgis3 port with qt59 is only workaround to make it usable
 for serious work. Therefore It would be nice to have convienient option to
 +qt59 variant. Please add this variant to the port.

 To Install qgis3 port with qt59 I had to manually edited two ports
 definition:
 1. Uninstall all ports and macports files.
 2. To qgis3 port I added these lines: https://github.com/macports
 /macports-ports/commit/312eec49096c92819071c3e87bea0ef9a562eed8
 3. I also had to Install older version of py-pyqt5 port. I installed 5.9.2
 version. The recent version just install qt5 port which makes conflict
 with qt59.

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