What is the time complexity of add spline point?
you can perform test on large amount points and compare function calls time consumption or try dive into profiler, maybe it have stats for specific function calls and their time execution https://docs.unrealengine.com/latest/INT/Engine/Performance/Profiler/index.html
p.s. don't forget mark question as answered with little gray circle button under any answer (not comment, but whole answer) when problem solved, so anyone else later can have same question and may find solution faster, if you find solution on your own, don't forget write it too
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