[openstreetmap/openstreetmap-website] Query tool: hovering over relations sometimes unresponsive (#1608)

[mmd]

Testcase: http://www.openstreetmap.org/query?lat=43.5370&lon=-6.4806

Issue: I'm hovering over the different elements on the left. While ways are updated immediately on the map, hovering over the different relations a couple of times takes 5-30s each here. During that time, the UI appears somewhat sluggish, not to say frozen.

I realize that those relations are quite long, yet the Overpass API result returns an empty / null geometry for most part of the relation. What I find a bit puzzling is that overpass turbo renders the query results more or less instantaneously: http://overpass-turbo.eu/s/qPT

![image](https://user-images.githubusercontent.com/5842757/29003224-f59aab94-7ab2-11e7-996c-83f832d0e337.png)


![image](https://user-images.githubusercontent.com/5842757/29003202-86b4df7e-7ab2-11e7-8158-a50dbe75c21a.png)

Tested on Firefox 54.0 and Chrome 51, Ubuntu 16.04. 

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