deevroman left a comment (openstreetmap/openstreetmap-website#5009)

> For CPU slowdown I use browser built-in functionality.

Ah, chromium, got it. 20x slowdown is unrealistic. With this value, I can't 
move the map normally, even without the data layer. But even with 20x slowdown, 
the layer with 11k features is drawn in 4 seconds when rendered synchronously 
on my PC.

> In such case, there would be 30 seconds freeze of browser if there was 
> synchronous process.

This is not true because synchronous rendering is faster than asynchronous 
rendering. 

In general, I will most likely suggest a PR that disables asynchrony.

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