id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
13492	Fix errors is very slow	GerdP	team	"See #13491, same steps and test data.
One problem here is that `StyledMapRenderer.render()` is executed for each ""duplicate"" node that is ""fixed"". On my machine that means that maybe one error is fixed per second.
Since all the duplicate nodes are marked with a yellow dot in the ""Validation errors""
you will not see any change in the data layer. I don't know if it is intended to redraw, if yes, I think one redraw after each error class should be enough.
When I hide the layers the ""fix"" action for > 2000 errors is finished within 1 or 2 seconds. 
This problem is also in r10916 and r10786 from http://josm.openstreetmap.de 
"	enhancement	closed	normal	19.03	Core		fixed	Performance Fix-Error	james2432