diff --git a/metadata/com.capyreader.app.yml b/metadata/com.capyreader.app.yml
index c9d2b0c138..f59e259fdf 100644
--- a/metadata/com.capyreader.app.yml
+++ b/metadata/com.capyreader.app.yml
@@ -260,6 +260,10 @@ Builds:
       - apt-get update
       - apt-get install -y -t trixie openjdk-21-jdk-headless
       - update-alternatives --auto java
+      - export CPUS_MAX=6
+      - export CPUS=$(getconf _NPROCESSORS_ONLN)
+      - for (( c=$CPUS_MAX; c<$CPUS; c++ )) ; do echo 0 > /sys/devices/system/cpu/cpu$c/online
+        ; done
     gradle:
       - free
     prebuild: sed -i -e '/firebase/d' -e '/gms.google/d' build.gradle.kts ../build.gradle.kts