Connection Handler lag

Hello, my tps drops when players join
I looked at timings and saw that Minecraft::Connection Handler eats so much resourses, while online is 4-5 players
System: vds, 1.12.2 paper, 8gb (6.8gb allocated) ram, i7-8700k 2 core x 4.7ghz and 40 ssd
(timings are below)

I read that decreasing netty-threads value can help me, is it true?