With a thousand points, you barely notice the delay. With a million, you're doing a million distance calculations for every single query. On a phone updating the map as the user scrolls, that's untenable.
"The work-life balance was at the heart of it," adds de Wit, who disagrees with the suggestion that their staff are now doing less work for the same amount of money. Instead he puts it down to "working smarter not harder".
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"Young people want the the opportunity to work," he said. "To get a decent career and move on in life and own their own home and all the things that young people down the generations have wanted to do."