id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
21950	[PATCH] Significantly reduce freeze when deleting a node with the relation editor open	taylor.smock	team	"From comment:36:ticket:21825 (test relation was [https://osm.org/relation/1205151 Lake Huron]):

Measurements (async profiler) for attachment:21825.avoid_loop_MemberTableModel_wayNodesChanged.patch:ticket:21825

Original code (no patches, jar downloaded from website, 30s for update on node delete, profiling was ~36s long, EDT blocked for ~30s):
* CPU
 * EDT: 69.31% of all
  * MemberTableModel#wayNodesChanged: 65.89% of all, 95% of EDT
 * G1: 21.09% of all
* Memory
 * EDT: 80.75% of all
  * MemberTableModel#wayNodesChanged: 66.93% of all, 82% of EDT
  * MapView painting: 13.07% of all, 16.18% of EDT
 * AutoSaveTask: 19.16% of all

New code (~6s for update on node delete -- most of time is from moving mouse to start/stop profiling, also has validator changes, EDT blocked for <1s at any time):
* CPU
 * EDT: 16.99% of all
  * MemberTableModel#wayNodesChanged: 1.98% of all, 11.65% of EDT
 * G1: 6.31% of all
 * Validation: 68.41% of all
* Memory
 * EDT: 97.76% of all
  * MemberTableModel#wayNodesChanged: 6.04% of all, 6.17% of EDT
  * MapView painting: 79.59% of all, 81.41% of EDT
 * Validation: 1.48% of all

No listeners (at least in core JOSM) actually check for which column is modified. Or even what changed in the table."	defect	closed	normal	22.03	Core		fixed	performance