diff --git a/backend/scripts/repl b/backend/scripts/repl
index 3c8b1a6c6a..1f434abcfb 100755
--- a/backend/scripts/repl
+++ b/backend/scripts/repl
@@ -2,7 +2,7 @@
 
 export PENPOT_ASSERTS_ENABLED=true
 
-export OPTIONS="-A:jmx-remote:dev -J-Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager -J-Xms512m -J-Xmx512m -J-Dlog4j2.configurationFile=log4j2-devenv.xml";
+export OPTIONS="-A:jmx-remote:dev -J-Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager -J-Dlog4j2.configurationFile=log4j2-devenv.xml -J-XX:+UseZGC -J-XX:ConcGCThreads=1 -J-XX:-OmitStackTraceInFastThrow -J-Xms50m -J-Xmx512m";
 # export OPTIONS="$OPTIONS -J-XX:+UnlockDiagnosticVMOptions";
 # export OPTIONS="$OPTIONS -J-XX:-TieredCompilation -J-XX:CompileThreshold=10000";
 
diff --git a/frontend/shadow-cljs.edn b/frontend/shadow-cljs.edn
index b668fa2d47..ffe3cf8884 100644
--- a/frontend/shadow-cljs.edn
+++ b/frontend/shadow-cljs.edn
@@ -1,6 +1,8 @@
 {:http {:port 3448}
  :nrepl {:port 3447}
- :jvm-opts ["-Xmx600m" "-Xms50m" "-XX:+UseSerialGC"]
+ :jvm-opts ["-Xmx600m" "-Xms50m"
+            "-XX:+UseZGC" "-XX:ConcGCThreads=1"
+            "-XX:-OmitStackTraceInFastThrow"]
  :dev-http {8888 "classpath:public"}
 
  :source-paths ["src", "vendor", "resources", "../common", "tests", "dev"]