diff --git a/.cargo/config-ci.toml b/.cargo/config-ci.toml
index e66ca5fb7..ff42c9675 100644
--- a/.cargo/config-ci.toml
+++ b/.cargo/config-ci.toml
@@ -2,8 +2,15 @@
 debug = "none"
 incremental = false
 
+[target.x86_64-unknown-linux-gnu]
+rustflags = ["-Clink-arg=-fuse-ld=mold"]
+
+[target.aarch64-unknown-linux-gnu]
+rustflags = ["-Clink-arg=-fuse-ld=mold"]
+
+[target.x86_64-pc-windows-msvc]
+linker = "rust-lld.exe"
 # NOTE: on Windows, build with the static CRT, so that produced .exe files don't
 # depend on vcruntime140.dll; otherwise the user requires visual studio if they
 # download a raw .exe
-[target.x86_64-pc-windows-msvc]
 rustflags = ["-Ctarget-feature=+crt-static"]
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c90797110..cf78da010 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -80,6 +80,10 @@ jobs:
     - uses: taiki-e/install-action@0f58b6a196e0d71c72fd459ab8fd8b228f85f669
       with:
         tool: nextest,taplo-cli
+    - name: Install mold
+      uses: rui314/setup-mold@f80524ca6eeaa76759b57fb78ddce5d87a20c720
+      with:
+        make-default: false
     - name: Build
       run: >-
         cargo build