diff --git a/kbuildx/scripts/freebsd-deps.sh b/kbuildx/scripts/freebsd-deps.sh
index 59a9a18..3f5fdff 100755
--- a/kbuildx/scripts/freebsd-deps.sh
+++ b/kbuildx/scripts/freebsd-deps.sh
@@ -8,12 +8,15 @@ if ! mount | grep -q ' /root/kbuildx '; then
         mount "$data_disk" /root/kbuildx
     else
         printf '%s\n' 'Formatting FreeBSD build disk'
-        newfs -b 32768 -f 4096 -i 16384 "$data_disk"
+        # Optimisé pour FreeBSD sous libkrun : UFS2 (par défaut), inodes réduits, espace max
+        newfs -U -b 16384 -f 2048 -i 32768 -m 1 "$data_disk"
         printf '%s\n' 'Mounting new FreeBSD build disk'
-        mount "$data_disk" /root/kbuildx
+        # Montage avec support des Soft Updates et async pour booster les builds
+        mount -o async "$data_disk" /root/kbuildx
     fi
 fi
 
+
 marker=/var/db/kbuildx-root-grown
 if [ ! -e "$marker" ]; then
     printf '%s\n' 'Growing FreeBSD root filesystem to fill the virtual disk'
diff --git a/kbuildx/scripts/netbsd-deps.sh b/kbuildx/scripts/netbsd-deps.sh
index 82c50c9..5a47540 100755
--- a/kbuildx/scripts/netbsd-deps.sh
+++ b/kbuildx/scripts/netbsd-deps.sh
@@ -11,7 +11,8 @@ if ! mount | grep -q ' /root/kbuildx '; then
         mount "$data_disk" /root/kbuildx
     else
         printf '%s\n' 'Formatting NetBSD build disk'
-        newfs -b 32768 -f 4096 -i 16384 "$data_disk"
+        # Optimisé pour libkrun : UFS2, blocs standards, densité d'inodes équilibrée
+        newfs -O 2 -b 16384 -f 2048 -i 32768 -m 1 "$data_disk"
         printf '%s\n' 'Mounting new NetBSD build disk'
         mount "$data_disk" /root/kbuildx
     fi