The build directories that Netbeans uses are pounded a lot, and chances are you have enough ram to leverage tmpfs. Let do it! Start with our /etc/rc.local file:

echo deadline > /sys/block/sda/queue/scheduler
echo 1 > /sys/block/sda/queue/iosched/fifo_batch

D=/home/jreynolds/.cache/netbeans
rm -rf   $D/*
mount    $D
chown -R jreynolds:jreynolds $D

D=/home/jreynolds/NetBeansProjects/MyProject/build
rm -rf   $D/*
mount    $D
# dont furgit the ram directory wants to be regularly deleted by netbeans
mkdir    $D/ram
chown -R jreynolds:jreynolds $D

D=/home/jreynolds/build/build-lib/
rm -rf   $D/*
mount    $D
mkdir    $D/jar
mkdir    $D/classes
chown -R jreynolds:jreynolds $D
exit 0

Next we make our /etc/fstab match:

none /var/tmp                            tmpfs    defaults,noatime  0 0
none /tmp                                tmpfs    defaults,noatime  0 0
none /home/jreynolds/.cache/chromium     tmpfs    noatime,noexec    0 0
none /home/jreynolds/.cache/netbeans     tmpfs    noauto,noatime    0 0
none /home/jreynolds/NetBeansProjects/MyProject/build        tmpfs defaults,noatime,noauto 0 0
none /home/jreynolds/.mozilla/firefox/0m31s0ag.default/Cache tmpfs defaults,noatime,noexec 0 0
none /home/jreynolds/build/myproject-lib tmpfs    noauto,noatime    0 0