Comment 8 for bug 1813038

With the attached here patch applied, the performance when moving duplicated items is still low. But when duplicating, the duplicated items do not follow the cursor at all, until I zoom/pan. Also, when moving lines/polygons/zones, their control points now do not move with the rest of the item.

If the first fix is reverted, then when moving items, they do not follow the cursor until I zoom/pan.