By default, JetBrains products (IntelliJ, WebStorm, etc) products default to a very small minimum (128 MB) and maximum (750 MB) Java Heap Space: ➜ ps aux | grep -i webstorm .. nick 22103 383 2.7 6838044 901056 .. /usr/lib/jvm/default/bin/java -agentlib:yjpagent-linux64=disablealloc,delay=10000,sessionname=WebStorm2016.2 -Xbootclasspath/a:/opt/webstorm-eap/bin/../lib/boot.jar -classpath /opt/webstorm-eap/bin/../lib/bootstrap.jar:/opt/webstorm-eap/bin/../lib/extensions.jar:/opt/webstorm-eap/bin/../lib/util.jar:/opt/webstorm-eap/bin/../lib/jdom.jar:/opt/webstorm-eap/bin/../lib/log4j.jar:/opt/webstorm-eap/bin/../lib/trove4j.jar:/opt/webstorm-eap/bin/../lib/jna.jar -Xms128m -Xmx750m -XX:ReservedCodeCacheSize=240m -XX:+UseConcMarkSweepGC -XX:SoftRefLRUPolicyMSPerMB=50 -ea -Dsun.io.useCanonCaches=false -Djava.net.preferIPv4Stack=true -XX:+HeapDumpOnOutOfMemoryError -XX:-OmitStackTraceInFastThrow -XX:MaxJavaStackTraceDepth=-1 -Dawt.useSystemAAFontSettings=lcdContinue reading JetBrains IDEs — Increasing Initial and Maximum Java Heap Space