On 14 February 2018 at 23:38, Enrico Fiore <enricofi...@libero.it> wrote:
>> Il 14 febbraio 2018 alle 12.43 Nyall Dawson <nyall.daw...@gmail.com> ha 
>> scritto:
>> >
>> Let me guess - it's a point layer?
> yes, it is
>> >
>> > Can be a bug?
>> Yes, it is.
> I have to open a ticket?

I think there's already an open ticket. I looked into this a while
ago. The culprit is this line (added in 2.16, or 2.18. I can't


Which is very slow to calculate, and is called for every symbol in
your layer (so 2381 times) at every map pan/zoom operation.

I only had a brief opportunity to look into it and could not find a
quick fix for this.

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