diff --git a/.github/workflows/pages.yml b/.github/workflows/pages.yml
index ea11518..a85f62e 100644
--- a/.github/workflows/pages.yml
+++ b/.github/workflows/pages.yml
@@ -54,7 +54,7 @@ jobs:
           curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
 
       - name: Build WebAssembly project
-        run: wasm-pack build --target web
+        run: bin/build-wasm.sh
         working-directory: geomedea-wasm
 
       - name: Copy web assets
diff --git a/Cargo.toml b/Cargo.toml
index db7e6eb..d186987 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,12 +11,3 @@ members = [
 # waiting for release
 geozero = { git = "https://github.com/georust/geozero", rev = "8501fedf288adc851d08a367f8f651ee643d4bed" }
 
-[profile.release]
-# with nothing: 689k            # 688680
-lto = true                      # 688563
-opt-level = 'z'                 # 627672
-# + wee_alloc                   # 621205
-# w/o console_logging
-# and console_error_panic_hook: # 614374
-# w/o log                       # 612566
-# After cleanups (adding #cfg)  # 610765
\ No newline at end of file
diff --git a/geomedea-wasm/.gitignore b/geomedea-wasm/.gitignore
index 4e30131..9aceb1e 100644
--- a/geomedea-wasm/.gitignore
+++ b/geomedea-wasm/.gitignore
@@ -1,6 +1,3 @@
-/target
-**/*.rs.bk
 Cargo.lock
-bin/
 pkg/
 wasm-pack.log
diff --git a/geomedea-wasm/bin/build-wasm.sh b/geomedea-wasm/bin/build-wasm.sh
new file mode 100755
index 0000000..67306f9
--- /dev/null
+++ b/geomedea-wasm/bin/build-wasm.sh
@@ -0,0 +1,11 @@
+set -ex
+
+REPO_ROOT=$(git rev-parse --show-toplevel)
+cd "$REPO_ROOT/geomedea-wasm"
+
+wasm-pack build --target web --release . \
+    --config 'profile.release.opt-level="z"' \
+    --config 'profile.release.lto=true'
+
+ls -l pkg/geomedea_wasm_bg.wasm
+