[openstreetmap/openstreetmap-website] "layeradd layerremove" event handlers dramatically slow down Map data layer rendering (Issue #5466)

[mmd]

By the way, if you're looking into map data layer performance, we're also spending some time in XML parsing (DOMParser.parseFromString). Maybe we could switch to /map.json and directly parse the response as json(). Both Rapid and iD are using json for performance reasons.

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