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fix performance issue with 16k+ sites#36
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Hi!
making some tests I've noticed a huge performance issue using more than 16k sites (2*14+ for precision sake). Making some profiling it results that the splice in clipEdges() slow down a lot with large arrays (from 0.3s for 12k points to 4s for 16k). I've removed de splice, making a new array with unshift and now it take 0.35 for 16k sites and 1.5s for 65k.
hope this fix can be helpful :)
thanks a lot for your work ;)