I recently bought the R-GO Split keyboard too and on Ubuntu 20.04 (Gnome) it 
was very laggy.
What I did to get rid of the lag was to simply switch from Gnome to KDE Plasma 
Desktop. Switching to Wayland worked too, but unfortunately, Wayland was 
causing problems with Skype and Audacity. So that's why I'm using KDE now. It 
might take some time to get used to KDE Plasma Desktop but it's a great Window 
Manager and seems to be a lot more stable than Gnome and Wayland. 

I also tried to switch to the Brasilien keyboard and commenting out
"modifier_map Mod3 { Scroll_Lock };". But it didn't work even after
restarting several times and making sure that the Brasilian keyboard was
selected. Maybe it worked with an earlier version of Ubuntu but at least
for me with Ubuntu 20.04 (Gnome) it didn't have any effect.

Hope this is helpful!

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https://bugs.launchpad.net/bugs/1777708

Title:
  Desktop briefly becomes unresponsive when typing on 2 keyboards at the
  same time

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