@dkazakov Thanks. It’s really smooth. I haven’t got time for a long test; but I reopened a heavy page and applied Fast Overlay Color filter via a Layer Mask on the ‘sketch’ group. I could draw without noticing any performance issue. So I guess this is a valid technical choice to composite a feature like that. I tested also moving things around, transform.Ctrl+C and Ctrl+V. All feels smooth. 
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