Weird linux cpu usage and blink some icons when source edit.

Hello all. I'm beginner of kotlin. I'm manjaro x64 version linux user. I tried stable default linux kernel and last kernel. I tried intellij idea community 2019.2.1 and 2019.2.2.

When editing that code cpu usage normal. System likely idle. CPU usage near %0. Some icons not blinking. If there is help bulb not blinking.

fun main(args:Array<String>) {
    println("Hello,Kotlin!")
}

When editing that code cpu usage is not normal. CPU usage near %20 ( my cpu ryzen 1700 @ 3.7 GHZ ) Some icons blinking. Help bulb's comment blinking.

fun main(args: Array<String>) {
    println(2+6)
    println(10-2)
    println(2*4)
    println(24/3)
    println(22/7)
    println(22.0/7.0)
    println(28 % 10)
    println(28.0 % 10.0)
    println((("%.0f".format(28.0 % 10.0)))+1)
    println((28.0 % 10.0)+1)
    }

This problem showing at editing aritmetric operation included codes.

I tried "https://intellij-support.jetbrains.com/hc/en-us/community/posts/360001355119-High-CPU-usage" this post. Not solution.

When editing aritmetric included code cpu usage near %20. If i press "help - change memory settings" icon from menu then cpu usage near %0. when i closed change memory settings window cpu usage near %20 again.