diff --git a/.github/workflows/publish-npm.yml b/.github/workflows/publish-npm.yml
index 85399b8..e34a6bc 100644
--- a/.github/workflows/publish-npm.yml
+++ b/.github/workflows/publish-npm.yml
@@ -35,6 +35,9 @@ jobs:
             --out-dir ../../pkg \
             --out-name libveritas
 
+      - name: Report WASM size
+        run: ls -lh pkg/libveritas_bg.wasm
+
       - name: Add Node.js wrapper
         run: cp bindings/wasm/node.js pkg/node.js
 
diff --git a/Cargo.toml b/Cargo.toml
index 1011cb1..e37d3ad 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -28,4 +28,8 @@ spacedb          = { version = "0.1", default-features = false, features = ["ext
 opt-level = 3
 
 [profile.release]
-lto = true
+lto = "fat"
+opt-level = "z"
+codegen-units = 1
+panic = "abort"
+strip = true
diff --git a/bindings/wasm/Cargo.toml b/bindings/wasm/Cargo.toml
index 6d6edf8..231c076 100644
--- a/bindings/wasm/Cargo.toml
+++ b/bindings/wasm/Cargo.toml
@@ -19,3 +19,7 @@ spaces_nums = { workspace = true }
 
 [dev-dependencies]
 wasm-bindgen-test = "0.3"
+
+[package.metadata.wasm-pack.profile.release]
+# Pass --enable-bulk-memory so newer rustc output validates, and -Oz for size.
+wasm-opt = ["-Oz", "--enable-bulk-memory", "--enable-mutable-globals", "--enable-sign-ext", "--enable-nontrapping-float-to-int"]