frequency drop problem of topic "/aft_mapped_to_init"

[ahandsomeperson]

@laboshinl Hi! I met a bug now in the LaserMapping node. The bug is that the frequency of topic "/aft_mapped_to_init" is getting lower and lower. At the beginning, it is about 5hz. But when I run a VLP16 dataset over 30 minutes, this frequency became 3hz at last. I want to use "/aft_mapped_to_init" as the input of my system. But I have no idea about how to solve the frequency drop problem. My CPU is i7 8750hq. My system is Ubuntu 16.04. How can I get rid of this problem? Thanks!