diff --git a/readme.md b/readme.md
index 7cf118b..c7365aa 100644
--- a/readme.md
+++ b/readme.md
@@ -99,7 +99,7 @@ docker run -it --rm -p 5000:5000 --device=/dev/kvm --cap-add NET_ADMIN --stop-ti
       DISK_FMT: "qcow2"
     ```
 
-    Please note that disabling preallocation will negatively affect write performance any time the image needs to grow.
+    Please note that this may reduce the write performance of the disk.
 
   * ### How do I increase the amount of CPU or RAM?
 
diff --git a/src/disk.sh b/src/disk.sh
index 360f134..35c1d58 100644
--- a/src/disk.sh
+++ b/src/disk.sh
@@ -3,12 +3,12 @@ set -Eeuo pipefail
 
 # Docker environment variables
 
-: ${DISK_IO:='native'}                          # I/O Mode, can be set to 'native', 'threads' or 'io_turing'
-: ${DISK_FMT:='raw'}                            # Disk file format, 'raw' by default for best performance
-: ${DISK_CACHE:='none'}                         # Caching mode, can be set to 'writeback' for better performance
-: ${DISK_DISCARD:='on'}                         # Controls whether unmap (TRIM) commands are passed to the host.
-: ${DISK_ROTATION:='1'}                         # Rotation rate, set to 1 for SSD storage and increase for HDD
-: ${DISK_FLAGS:='nocow=on,cluster_size=2M'}     # Specifies the options for use with the qcow2 disk format
+: ${DISK_IO:='native'}          # I/O Mode, can be set to 'native', 'threads' or 'io_turing'
+: ${DISK_FMT:='raw'}            # Disk file format, 'raw' by default for best performance
+: ${DISK_CACHE:='none'}         # Caching mode, can be set to 'writeback' for better performance
+: ${DISK_DISCARD:='on'}         # Controls whether unmap (TRIM) commands are passed to the host.
+: ${DISK_ROTATION:='1'}         # Rotation rate, set to 1 for SSD storage and increase for HDD
+: ${DISK_FLAGS:='nocow=on'}     # Specifies the options for use with the qcow2 disk format
 
 BOOT="$STORAGE/$BASE.boot.img"
 SYSTEM="$STORAGE/$BASE.system.img"
@@ -17,10 +17,11 @@ SYSTEM="$STORAGE/$BASE.system.img"
 [ ! -f "$SYSTEM" ] && error "Virtual DSM system-image does not exist ($SYSTEM)" && exit 82
 
 DISK_OPTS="\
-    -device virtio-scsi-pci,id=hw-synoboot,bus=pcie.0,addr=0xa \
+    -object iothread,id=io1 -object iothread,id=io2 \
+    -device virtio-scsi-pci,id=hw-synoboot,iothread=io1,bus=pcie.0,addr=0xa \
     -drive file=$BOOT,if=none,id=drive-synoboot,format=raw,cache=$DISK_CACHE,aio=$DISK_IO,discard=$DISK_DISCARD,detect-zeroes=on \
     -device scsi-hd,bus=hw-synoboot.0,channel=0,scsi-id=0,lun=0,drive=drive-synoboot,id=synoboot0,rotation_rate=$DISK_ROTATION,bootindex=1 \
-    -device virtio-scsi-pci,id=hw-synosys,bus=pcie.0,addr=0xb \
+    -device virtio-scsi-pci,id=hw-synosys,iothread=io1,bus=pcie.0,addr=0xb \
     -drive file=$SYSTEM,if=none,id=drive-synosys,format=raw,cache=$DISK_CACHE,aio=$DISK_IO,discard=$DISK_DISCARD,detect-zeroes=on \
     -device scsi-hd,bus=hw-synosys.0,channel=0,scsi-id=0,lun=0,drive=drive-synosys,id=synosys0,rotation_rate=$DISK_ROTATION,bootindex=2"
 
@@ -145,7 +146,7 @@ resizeDisk() {
   DATA_SIZE=$(numfmt --from=iec "$DISK_SPACE")
   local REQ=$((DATA_SIZE-CUR_SIZE))
   (( REQ < 1 )) && error "Shrinking disks is not supported yet, please increase ${DISK_DESC^^}_SIZE." && exit 71
-  
+
   if [[ "$ALLOCATE" != [Nn]* ]]; then
 
     # Check free diskspace
@@ -259,7 +260,7 @@ addDisk () {
   local DISK_ADDRESS=$7
   local DISK_FMT=$8
   local DISK_FILE="$DISK_BASE.$DISK_EXT"
-  local DIR FS DATA_SIZE PREV_FMT PREV_EXT CUR_SIZE
+  local DIR FS FA DATA_SIZE PREV_FMT PREV_EXT CUR_SIZE
 
   DIR=$(dirname "$DISK_FILE")
   [ ! -d "$DIR" ] && return 0
@@ -268,6 +269,18 @@ addDisk () {
   if [[ "$FS" == "overlay"* ]]; then
     info "Warning: the filesystem of $DIR is OverlayFS, this usually means it was binded to an invalid path!"
   fi
+  if [[ "$FS" == "btrfs"* ]]; then
+    if [ -f "$DISK_FILE" ] ; then
+      FA=$(lsattr "$DISK_FILE")
+      [[ "$FA" == *"C"* ]] && FA=$(lsattr -d "$DIR")
+    else
+      FA=$(lsattr -d "$DIR")
+    fi
+    if [[ "$FA" != *"C"* ]]; then
+      info "Warning: the filesystem of $DIR is BTRFS, and COW (copy on write) is not disabled for that folder!"
+      info "This will negatively affect write performance, please empty the folder and disable COW (chattr +C <path>)."
+    fi
+  fi
 
   [ -z "$DISK_SPACE" ] && DISK_SPACE="16G"
   DISK_SPACE=$(echo "$DISK_SPACE" | sed 's/MB/M/g;s/GB/G/g;s/TB/T/g')
@@ -306,7 +319,7 @@ addDisk () {
   fi
 
   DISK_OPTS="$DISK_OPTS \
-    -device virtio-scsi-pci,id=hw-$DISK_ID,bus=pcie.0,addr=$DISK_ADDRESS \
+    -device virtio-scsi-pci,id=hw-$DISK_ID,iothread=io2,bus=pcie.0,addr=$DISK_ADDRESS \
     -drive file=$DISK_FILE,if=none,id=drive-$DISK_ID,format=$DISK_FMT,cache=$DISK_CACHE,aio=$DISK_IO,discard=$DISK_DISCARD,detect-zeroes=on \
     -device scsi-hd,bus=hw-$DISK_ID.0,channel=0,scsi-id=0,lun=0,drive=drive-$DISK_ID,id=$DISK_ID,rotation_rate=$DISK_ROTATION,bootindex=$DISK_INDEX"
 
@@ -381,7 +394,7 @@ addDevice () {
   [ ! -b "$DISK_DEV" ] && error "Device $DISK_DEV cannot be found! Please add it to the 'devices' section of your compose file." && exit 55
 
   DISK_OPTS="$DISK_OPTS \
-    -device virtio-scsi-pci,id=hw-$DISK_ID,bus=pcie.0,addr=$DISK_ADDRESS \
+    -device virtio-scsi-pci,id=hw-$DISK_ID,iothread=io2,bus=pcie.0,addr=$DISK_ADDRESS \
     -drive file=$DISK_DEV,if=none,id=drive-$DISK_ID,format=raw,cache=$DISK_CACHE,aio=$DISK_IO,discard=$DISK_DISCARD,detect-zeroes=on \
     -device scsi-hd,bus=hw-$DISK_ID.0,channel=0,scsi-id=0,lun=0,drive=drive-$DISK_ID,id=$DISK_ID,rotation_rate=$DISK_ROTATION,bootindex=$DISK_INDEX"
 
diff --git a/src/install.sh b/src/install.sh
index aa106a4..1190c1c 100644
--- a/src/install.sh
+++ b/src/install.sh
@@ -55,6 +55,13 @@ FS=$(stat -f -c %T "$STORAGE")
 if [[ "$FS" == "overlay"* ]]; then
   info "Warning: the filesystem of $STORAGE is OverlayFS, this usually means it was binded to an invalid path!"
 fi
+if [[ "$FS" == "btrfs"* ]]; then
+  FA=$(lsattr -d "$STORAGE")
+  if [[ "$FA" != *"C"* ]]; then
+    info "Warning: the filesystem of $STORAGE is BTRFS, and COW (copy on write) is not disabled for that folder!"
+    info "This will negatively affect write performance, please empty the folder and disable COW (chattr +C <path>)."
+  fi
+fi
 
 if [[ "$FS" != "fat"* && "$FS" != "vfat"* && "$FS" != "exfat"* && \
         "$FS" != "ntfs"* && "$FS" != "fuse"* && "$FS" != "msdos"* ]]; then
diff --git a/src/power.sh b/src/power.sh
index 18f87c1..0cdbc9b 100644
--- a/src/power.sh
+++ b/src/power.sh
@@ -4,7 +4,7 @@ set -Eeuo pipefail
 # Configure QEMU for graceful shutdown
 
 QEMU_PORT=7100
-QEMU_TIMEOUT=50
+QEMU_TIMEOUT=55
 QEMU_PID="/run/qemu.pid"
 QEMU_COUNT="/run/qemu.count"
 
@@ -67,6 +67,10 @@ _graceful_shutdown() {
 
   done
 
+  if [ "$(cat $QEMU_COUNT)" -ge "$QEMU_TIMEOUT" ]; then
+    echo && error "Shutdown timeout reached, forcefully quitting.."
+  fi
+
   echo && echo "❯ Quitting..."
   echo 'quit' | nc -q 1 -w 1 localhost "$QEMU_PORT" >/dev/null 2>&1 || true