As per the Specjbb benchmark, JDK9 compact strings optimization itself provides, * 21% memory footprint reduction * 27% less GC * 5% throughput improvmen

As per the Specjbb benchmark, JDK9 compact strings optimization itself provides, * 21% memory footprint reduction * 27% less GC * 5% throughput improvments https://www.infoq.com/presentations/java-se-9-cloud https://www.infoq.com/presentations/java-se-9-cloud - check this presentation for more details.