Did not see it noted in those threads/issues, have you tried turning off these settings?
Config setting for config.xml/command-line noted in brakets.
- UI->Show side panel planets (probably not relevant)
[UI.sidepanel-planet-shown 0] - Galaxy Map->Galaxy map gas rendering
[UI.galaxy-gas-background 0] - Galaxy Map->Galaxy map star fields rendering
[UI.galaxy-starfields 0]
Or Video->Fullscreen [fullscreen 1] and toggling Video->Fake resolution change [fake-mode-change 0], may need client restart
I realize this may require alt+f4 to close the app, since the cursor is invisible.