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Default Pencil Brush lags significantly on external monitor #467
Brush working fine in laptop. But when connected to external SONY 32inch monitor via HDMI cable, default pencil brush show considerable lag (4-5 second).
Kindly let me know if need more information.
Something to try: does the experimental build (v1.2.0-beta.2.0.threadfun) I recently added to https://github.com/mypaint/mypaint/releases/tag/v1.2.0-beta.2 improve this issue?
Please let me know if any additional information will help you to debugg better.
Nasty. The lines don't look as smooth in the second gif either. I'm not sure there's a lot we can do here: it looks very much in the territory of GDK/Cairo. Pointer position updates are clearly being captured right.
Try turning on Help→Debug→Visualize Rendering. The updates that come from drawing should be minimally-sized rectangles, in blue. If the entire screen flashes blue on each update when drawing, something's wrong in the MyPaint code.
Do you have GPU information as well?
I assume this is with your Wacom driver configured to map to the second (HDMI) display...?
When this happens (both cases), is the MyPaint window completely within the monitor in question?
Something else to try: stick the Windows CPU performance monitor in plain sight in your other monitor for both cases while you draw, and tell me if the CPU is being pegged (driven to ~100%) when this happens. If so, please let me know what's doing that.