Fedora-27 java compile is slow

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Since last updates for Fedora-27 (cannot say exactly which one) jdk 8 javac compilations are becoming super slow. compilation for my project takes 171s instead of 17s as usually

my top program shows me extremely high CPU utilisation for java:

  PID      USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
  7970     nmajorov  20   0 5237052 1,381g  28576 S 320,6  9,0   5:04.65 java

I tried compilation for same project on macosx - 17s. it is 10 times faster !!!

Cannot figure out what is going wrong .. any hints ?