Poor Rendering Performance on MBP, 16'' 2019 Gazebo 9

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The rendering performance can barely crawl above 2 fps.

Using Parallels I was able to achieve ~40 fps with Ubuntu 16.04 and ~60 fps with ubuntu 18.04.

CPU load stays low and the real time factors remains at 1, so it's only a graphics related issue. Is there something I do to improve the performance ? Thanks

Gazebo is installed using brew

brew info gazebo9
osrf/simulation/gazebo9: stable 9.11.0 (bottled), HEAD
Gazebo robot simulator
http://gazebosim.org
Conflicts with:
  gazebo10 (because Differing version of the same formula)
  gazebo11 (because Differing version of the same formula)
  gazebo2 (because Differing version of the same formula)
  gazebo3 (because Differing version of the same formula)
  gazebo4 (because Differing version of the same formula)
  gazebo5 (because Differing version of the same formula)
  gazebo6 (because Differing version of the same formula)
  gazebo7 (because Differing version of the same formula)
  gazebo8 (because Differing version of the same formula)
/usr/local/Cellar/gazebo9/9.11.0_4 (1,260 files, 126.9MB) *
  Poured from bottle on 2019-12-30 at 10:35:07
From: https://github.com/osrf/homebrew-simulation/blob/master/Formula/gazebo9.rb
==> Dependencies
Build: cmake ✔, pkg-config ✔
Required: boost ✔, doxygen ✔, freeimage ✔, graphviz ✔, ignition-fuel-tools1 ✔, ignition-math4 ✔, ignition-msgs1 ✔, ignition-transport4 ✔, libtar ✔, ogre1.9 ✔, ossp-uuid ✔, protobuf ✔, protobuf-c ✔, qt ✔, qwt ✔, sdformat6 ✔, tbb ✔, tinyxml ✔, tinyxml2 ✔, zeromq ✔
Recommended: bullet ✔, dartsim ✔, ffmpeg ✔, gts ✔, simbody ✔
Optional: gdal ✘, player ✘
==> Options
--with-gdal
    Build with gdal support
--with-player
    Build with player support
--without-bullet
    Build without bullet support
--without-dartsim
    Build without dartsim support
--without-ffmpeg
    Build without ffmpeg support
--without-gts
    Build without gts support
--without-simbody
    Build without simbody support
--HEAD
    Install HEAD version

Best Regards Andreas