diff --git a/meta-opencentauri/images/opencentauri-image-base.bb b/meta-opencentauri/images/opencentauri-image-base.bb
index 7bbfddb3..c18a6d2c 100644
--- a/meta-opencentauri/images/opencentauri-image-base.bb
+++ b/meta-opencentauri/images/opencentauri-image-base.bb
@@ -9,6 +9,8 @@ inherit core-image
 
 IMAGE_FEATURES += "ssh-server-dropbear"
 
+BAD_RECOMMENDATIONS += "python3-unittest"
+
 CORE_IMAGE_EXTRA_INSTALL += "\
     usbutils \
     libgpiod \
diff --git a/meta-opencentauri/recipes-apps/klipper/files/klipper-init-d b/meta-opencentauri/recipes-apps/klipper/files/klipper-init-d
index 881925e2..d0b44c47 100644
--- a/meta-opencentauri/recipes-apps/klipper/files/klipper-init-d
+++ b/meta-opencentauri/recipes-apps/klipper/files/klipper-init-d
@@ -12,6 +12,9 @@ KLIPPY_EXEC="/usr/bin/python3"
 KLIPPY_ARGS="/usr/share/klipper/klippy/klippy.py /etc/klipper/config/printer.cfg -l /board-resource/klippy.log -a /run/klippy.sock"
 PIDFILE="/var/run/klipper.pid"
 
+export PYTHONDONTWRITEBYTECODE=1
+export PYTHONNOUSERSITE=1
+
 case "$1" in
     start)
         echo "Starting klipper..."
diff --git a/meta-opencentauri/recipes-apps/klipper/kalico_2026.02.00.bb b/meta-opencentauri/recipes-apps/klipper/kalico_2026.02.00.bb
index 4f30634f..60dbcfe3 100644
--- a/meta-opencentauri/recipes-apps/klipper/kalico_2026.02.00.bb
+++ b/meta-opencentauri/recipes-apps/klipper/kalico_2026.02.00.bb
@@ -15,7 +15,7 @@ SRC_URI += " \
     file://misc.cfg \
 "
 
-inherit python3-dir update-rc.d
+inherit python3-dir python3native update-rc.d
 
 RDEPENDS:${PN} = " \
     python3 \
@@ -72,9 +72,10 @@ do_install() {
     install -d ${D}${datadir}/klipper
     cp -r ${S}/klippy ${D}${datadir}/klipper/
 
-    # Remove any .pyc files to avoid TMPDIR references
-    find ${D} -name '*.pyc' -delete
-    find ${D} -name '__pycache__' -type d -exec rm -rf {} + 2>/dev/null || true
+    # Precompile optimized bytecode in place. Keep .py sources for Kalico:
+    # klippy/compat.py checks for on-disk .py files when resolving legacy imports.
+    nativepython3 -OO -m compileall -b -f ${D}${datadir}/klipper/klippy
+    find ${D}${datadir}/klipper -name '__pycache__' -type d -exec rm -rf {} + 2>/dev/null || true
 
     # Install default kalico config
     install -d ${D}${sysconfdir}/klipper
diff --git a/meta-opencentauri/recipes-apps/moonraker/files/moonraker-init-d b/meta-opencentauri/recipes-apps/moonraker/files/moonraker-init-d
index 8322199d..2ed36459 100644
--- a/meta-opencentauri/recipes-apps/moonraker/files/moonraker-init-d
+++ b/meta-opencentauri/recipes-apps/moonraker/files/moonraker-init-d
@@ -14,6 +14,8 @@ PIDFILE="/var/run/moonraker.pid"
 
 export PYTHONPATH="/usr/share/moonraker"
 export TMPDIR="/user-resource/.tmp"
+export PYTHONDONTWRITEBYTECODE=1
+export PYTHONNOUSERSITE=1
 
 case "$1" in
     start)
diff --git a/meta-opencentauri/recipes-apps/moonraker/moonraker_0.10.0.bb b/meta-opencentauri/recipes-apps/moonraker/moonraker_0.10.0.bb
index 69801769..7e98e814 100644
--- a/meta-opencentauri/recipes-apps/moonraker/moonraker_0.10.0.bb
+++ b/meta-opencentauri/recipes-apps/moonraker/moonraker_0.10.0.bb
@@ -17,7 +17,7 @@ S = "${WORKDIR}/git"
 
 PR = "r1"
 
-inherit python3-dir update-rc.d
+inherit python3-dir python3native update-rc.d
 
 DEPENDS = " \
     python3-native \
@@ -66,6 +66,14 @@ do_install() {
     install -d ${D}${datadir}/moonraker
     cp -r ${S}/moonraker ${D}${datadir}/moonraker/
 
+    # Precompile optimized bytecode in place. Keep metadata.py because
+    # Moonraker launches it directly for gcode metadata extraction.
+    nativepython3 -OO -m compileall -b -f ${D}${datadir}/moonraker/moonraker
+    find ${D}${datadir}/moonraker/moonraker -name '*.py' \
+        ! -path "${D}${datadir}/moonraker/moonraker/components/file_manager/metadata.py" \
+        -delete
+    find ${D}${datadir}/moonraker -name '__pycache__' -type d -exec rm -rf {} + 2>/dev/null || true
+
     # Install default moonraker config
     install -d ${D}${sysconfdir}/klipper
     install -d ${D}${sysconfdir}/klipper/config
diff --git a/meta-opencentauri/recipes-devtools/python/python3_%.bbappend b/meta-opencentauri/recipes-devtools/python/python3_%.bbappend
index d1881b4a..fa616809 100644
--- a/meta-opencentauri/recipes-devtools/python/python3_%.bbappend
+++ b/meta-opencentauri/recipes-devtools/python/python3_%.bbappend
@@ -1 +1,11 @@
+PACKAGECONFIG:remove:class-target = "gdbm tk tcl readline"
 PACKAGECONFIG:append:class-target = " lto pgo"
+
+BAD_RECOMMENDATIONS += " \
+    python3-tkinter \
+    python3-idle \
+    python3-pydoc \
+    python3-doctest \
+    python3-2to3 \
+    python3-dev \
+"
diff --git a/meta-opencentauri/recipes-python/tornado/python3-tornado_%.bbappend b/meta-opencentauri/recipes-python/tornado/python3-tornado_%.bbappend
new file mode 100644
index 00000000..2eabf894
--- /dev/null
+++ b/meta-opencentauri/recipes-python/tornado/python3-tornado_%.bbappend
@@ -0,0 +1 @@
+RDEPENDS:${PN}:remove = "python3-unittest"