I'm running my MiSTer simultaneously on a Gigabyte G27Q (1440p, VRR) and a JVC TM-H150C with the following config for output:
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vsync_adjust=2 video_mode=12 video_mode_ntsc=12 video_mode_pal=1920,1440,50 vrr_mode=2
At 60Hz scrolling is butter-smooth, nothing to complain about. With 50hz content (SNES, Amiga, Amstrad) scrolling on the LCD compared to the CRT is choppy and looks quite bad.
I also tried video_mode_pal=1920,128,208,336,1440,1,3,36,186050 but I didn't make a difference.
I am missing something?
Thank you in advance.