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

[Anton Khorev]

> and to prove their uselessness

You can see that the `_osm_location` cookie is updated. If you remove some event listeners, the cookie won't be updated on these events.

If you do `map.off("layeradd layerremove")` then after changing layers, going to some non-map-view page and going back to the map you'll see that your choice of layers wasn't remembered.

The problem is that those layer events happen probably more often than originally anticipated when the data layer is enabled.

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