diff --git a/Dockerfile.builder b/Dockerfile.builder
index b487e2d..e062bc9 100644
--- a/Dockerfile.builder
+++ b/Dockerfile.builder
@@ -21,6 +21,8 @@ RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-ins
 
 RUN curl https://sh.rustup.rs -sSf | sh -s -- -y --profile minimal
 ENV PATH="/root/.cargo/bin:$PATH"
+# Keep Rust/Tauri builds from saturating the small app server.
+ENV CARGO_BUILD_JOBS=1
 
 RUN rustup target add x86_64-pc-windows-msvc \
   && cargo install --locked cargo-xwin
@@ -35,7 +37,7 @@ COPY . .
 # the desktop app itself without creating updater signatures.
 RUN node -e "const fs=require('fs'); const p='src-tauri/tauri.conf.json'; const c=JSON.parse(fs.readFileSync(p,'utf8')); c.bundle.createUpdaterArtifacts=false; fs.writeFileSync(p, JSON.stringify(c,null,2)+'\\n')"
 
-RUN npm run bundle:windows
+RUN nice -n 10 npm run bundle:windows
 
 RUN set -eux; \
     mkdir -p /desktop-artifacts; \
diff --git a/Dockerfile.builder-linux b/Dockerfile.builder-linux
index a73cca0..2fc7488 100644
--- a/Dockerfile.builder-linux
+++ b/Dockerfile.builder-linux
@@ -17,6 +17,8 @@ RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-ins
 
 RUN curl https://sh.rustup.rs -sSf | sh -s -- -y --profile minimal
 ENV PATH="/root/.cargo/bin:$PATH"
+# Keep Rust/Tauri builds from saturating the small app server.
+ENV CARGO_BUILD_JOBS=1
 
 COPY package.json ./
 RUN npm install
@@ -25,7 +27,7 @@ COPY . .
 
 RUN node -e "const fs=require('fs'); const p='src-tauri/tauri.conf.json'; const c=JSON.parse(fs.readFileSync(p,'utf8')); c.bundle.createUpdaterArtifacts=false; fs.writeFileSync(p, JSON.stringify(c,null,2)+'\\n')"
 
-RUN npm run bundle:deb
+RUN nice -n 10 npm run bundle:deb
 
 RUN set -eux; \
     mkdir -p /desktop-artifacts; \