diff --git a/Dockerfile b/Dockerfile
index 915c727..a80a483 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -63,6 +63,7 @@ EXPOSE 5001
 
 ENV RAM_SIZE 512M
 ENV DISK_SIZE 16G
+ENV CPU_CORES 1
 
 #ENV URL https://global.synologydownload.com/download/DSM/beta/7.2/64216/DSM_VirtualDSM_64216.pat
 #ENV URL https://global.synologydownload.com/download/DSM/release/7.0.1/42218/DSM_VirtualDSM_42218.pat
diff --git a/docker-compose.yml b/docker-compose.yml
index 4851f33..1ed872c 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -6,6 +6,7 @@ services:
         environment:
             DISK_SIZE: "16G"
             RAM_SIZE: "512M"
+            CPU_CORES: "1"
         devices:
             - /dev/kvm
         cap_add:
diff --git a/run.sh b/run.sh
index 3c994f2..f5a35fe 100755
--- a/run.sh
+++ b/run.sh
@@ -38,7 +38,7 @@ fi
 pkill -f server.sh
 
 EXTRA_OPTS="-nographic -object rng-random,id=rng0,filename=/dev/urandom -device virtio-rng-pci,rng=rng0 -device virtio-balloon-pci,id=balloon0,bus=pcie.0,addr=0x4"
-ARGS="-m ${RAM_SIZE} -machine type=q35${KVM_ACC_OPTS} ${EXTRA_OPTS} ${KVM_MON_OPTS} ${KVM_SERIAL_OPTS} ${KVM_NET_OPTS} ${KVM_DISK_OPTS}"
+ARGS="-m ${RAM_SIZE} -smp $CPU_CORES -machine type=q35${KVM_ACC_OPTS} ${EXTRA_OPTS} ${KVM_MON_OPTS} ${KVM_SERIAL_OPTS} ${KVM_NET_OPTS} ${KVM_DISK_OPTS}"
 
 eval "qemu-system-x86_64 ${ARGS}" &
 
diff --git a/serial.sh b/serial.sh
index e33f82a..12ada03 100644
--- a/serial.sh
+++ b/serial.sh
@@ -20,7 +20,7 @@ if [ ! -f "$FILE" ]; then
 fi
 GUEST_SERIAL=$(cat "${FILE}")
 
-./run/serial.bin -cpu=1 \
+./run/serial.bin -cpu=$CPU_CORES \
                 -buildnumber=42962 \
                 -vmmts="1679863686" \
                 -hostsn="$HOST_SERIAL" \