diff --git a/src/spice2x/external/docker/Dockerfile b/src/spice2x/external/docker/Dockerfile
index 5032225..fa01867 100644
--- a/src/spice2x/external/docker/Dockerfile
+++ b/src/spice2x/external/docker/Dockerfile
@@ -25,10 +25,11 @@ ENV PATH="$PATH:/opt/llvm-mingw-xp/bin"
 RUN curl -fsSL "https://github.com/mon/windows-dll-compat-checker/releases/download/v1.3/windows_dll_compat_checker-linux-x86_64.tar.xz" \
     | tar -xJ -C /usr/local/bin
 
-# libjpeg-turbo for JPEG encoding. Only the mingw-w64 toolchains get it;
-# the WinXP targets build without JPEG support entirely.
-RUN su user -c "yay --noconfirm -S mingw-w64-libjpeg-turbo"
+# Stock makepkg.conf builds serially; this makes the AUR compiles below parallel.
+RUN printf '%s\n' 'MAKEFLAGS="-j$(nproc)"' > /home/user/.makepkg.conf \
+    && chown user: /home/user/.makepkg.conf
 
-# x264 for the API H.264 video stream. Only the mingw-w64 toolchains need it;
-# the WinXP targets build without the stream encoder.
-RUN su user -c "yay --noconfirm -S mingw-w64-x264"
+# libjpeg-turbo for JPEG encoding, x264 for the API H.264 video stream. Only the
+# mingw-w64 toolchains get these; the WinXP targets build without JPEG support
+# and without the stream encoder.
+RUN su user -c "yay --noconfirm -S mingw-w64-libjpeg-turbo mingw-w64-x264"