I just upgraded to the following:
Build #RM-145.597, built on March 30, 2016
JRE: 1.8.0_40-release-b132 x86_64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
And my CPU usage spiked to around 130% of my CPU just idling. Memory usage seems to be a constant ~850M. It also has 1357897 page faults in just over 28 minutes of runtime.
Feel free to ignore this - I just downgraded back to 8.0.3.