diff --git a/Cargo.toml b/Cargo.toml
index c3396f8c61..01616c3c1d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -90,3 +90,18 @@ path = "crates/math"
 
 [workspace.dependencies.rain_orderbook_js_api]
 path = "crates/js_api"
+
+# release profile for wasm build optimized for size reduction
+[profile.release-wasm]
+inherits = "release"
+opt-level = "z"
+lto = true
+strip = true
+panic = "abort"
+codegen-units = 1
+rpath = false
+debug = false
+incremental = false
+overflow-checks = false
+debug-assertions = false
+split-debuginfo = "packed"
diff --git a/flake.nix b/flake.nix
index ef1fa50678..79cff473b4 100644
--- a/flake.nix
+++ b/flake.nix
@@ -242,7 +242,7 @@
             body = ''
               set -euxo pipefail
 
-              cargo build -r --target wasm32-unknown-unknown --lib --workspace --exclude rain_orderbook_cli --exclude rain_orderbook_integration_tests
+              cargo build --profile release-wasm --target wasm32-unknown-unknown --lib -p rain_orderbook_js_api
             '';
           };
 
diff --git a/packages/orderbook/package.json b/packages/orderbook/package.json
index b013d9f359..82aafa504f 100644
--- a/packages/orderbook/package.json
+++ b/packages/orderbook/package.json
@@ -31,9 +31,8 @@
     ],
     "scripts": {
         "prepublish": "node ./scripts/setup",
-        "build": "npm run rm-dist && npm run rm-temp && node ./scripts/build",
-        "build-tauri": "npm run rm-dist && npm run rm-temp && node ./scripts/build tauri",
-        "build-wasm": "cargo build --target wasm32-unknown-unknown --lib -r --workspace --exclude rain_orderbook_cli --exclude rain_orderbook_integration_tests",
+        "build": "npm run rm-dist && npm run rm-temp && npm run build-wasm && node ./scripts/build && npm run check",
+        "build-wasm": "cargo build --target wasm32-unknown-unknown --lib --profile release-wasm -p rain_orderbook_js_api",
         "rm-dist": "rimraf ./dist",
         "rm-temp": "rimraf ./temp",
         "test": "npm run check && vitest run --dir test",
diff --git a/packages/orderbook/scripts/build.js b/packages/orderbook/scripts/build.js
index b980583a6d..1b3a252d67 100644
--- a/packages/orderbook/scripts/build.js
+++ b/packages/orderbook/scripts/build.js
@@ -1,34 +1,30 @@
 const fs = require("fs");
+const { sizeCheck } = require("./sizeCheck");
 const { execSync } = require("child_process");
-
-const [isTauriBuild = false] = process.argv.slice(2);
+const { buildCjs, buildEsm } = require("./buildPackage");
 
 // create root esm.js and cjs.js files with their .d.ts
 fs.writeFileSync(
   "./cjs.js",
   '"use strict";\n\nmodule.exports = require("./dist/cjs/index");\n'
 );
-fs.writeFileSync("./cjs.d.ts", 'export * from "./dist/types/index";\n');
+fs.writeFileSync("./cjs.d.ts", 'export * from "./dist/cjs/index";\n');
 fs.writeFileSync("./esm.js", 'export * from "./dist/esm/index";\n');
-fs.writeFileSync("./esm.d.ts", 'export * from "./dist/types/index";\n');
-
-// create dist dir
-fs.mkdirSync("./dist/cjs", { recursive: true });
-fs.mkdirSync("./dist/esm", { recursive: true });
-
-// build for wasm32 target
-execSync("npm run build-wasm");
+fs.writeFileSync("./esm.d.ts", 'export * from "./dist/esm/index";\n');
 
 // build specified packages and include them in final index file
 // list of packages to build can be extended by adding new package
 // names to the list below
-const packages = ["js_api"];
-for (const package of packages) {
-  execSync(`node ./scripts/buildPackage ${package} ${isTauriBuild ? 'true' : ''}`);
+const pkgs = ["js_api"];
+
+for (const pkg of pkgs) {
+  // build for cjs and esm
+  buildCjs(pkg);
+  buildEsm(pkg);
+
+  // check wasm size
+  sizeCheck(pkg);
 }
 
 // rm temp folder
 execSync("npm run rm-temp");
-
-// check bindings for possible errors
-execSync("npm run check");
diff --git a/packages/orderbook/scripts/buildPackage.js b/packages/orderbook/scripts/buildPackage.js
index 74a539128e..030c3f1f5a 100644
--- a/packages/orderbook/scripts/buildPackage.js
+++ b/packages/orderbook/scripts/buildPackage.js
@@ -2,88 +2,125 @@ const fs = require('fs');
 const { execSync } = require('child_process');
 
 const packagePrefix = 'rain_orderbook_';
-const [package, isTauriBuild = false] = process.argv.slice(2);
 
-// generate node/web bindgens
-execSync(
-	`wasm-bindgen --target nodejs ../../target/wasm32-unknown-unknown/release/${
-		packagePrefix + package
-	}.wasm --out-dir ./temp/node/${package} --out-name ${package}`
-);
-execSync(
-	`wasm-bindgen --target web ../../target/wasm32-unknown-unknown/release/${
-		packagePrefix + package
-	}.wasm --out-dir ./temp/web/${package} --out-name ${package}`
-);
+// after using opt-level on wasm build, WasmEncodedResult and WasmEncodedError
+// are duplicated in the dts so we need to dedupe them
+const dups = [
+    "\nexport type WasmEncodedResult<T> = { value: T; error: undefined } | { value: undefined; error: WasmEncodedError };\n",
+    `\nexport interface WasmEncodedError {
+    msg: string;
+    readableMsg: string;
+}\n`
+];
 
-// encode wasm as base64 into a json for cjs and esm that can be natively imported
-// in js modules in order to avoid using fetch or fs operations
-const wasmCjsBytes = fs.readFileSync(`./temp/node/${package}/${package}_bg.wasm`);
-fs.writeFileSync(
-	`./dist/cjs/orderbook_wbg.json`,
-	JSON.stringify({
-		wasm: Buffer.from(wasmCjsBytes, 'binary').toString('base64')
-	})
-);
-const wasmEsmBytes = fs.readFileSync(`./temp/web/${package}/${package}_bg.wasm`);
-fs.writeFileSync(
-	`./dist/esm/orderbook_wbg.json`,
-	JSON.stringify({
-		wasm: Buffer.from(wasmEsmBytes, 'binary').toString('base64')
-	})
-);
+module.exports.buildCjs = function (pkg) {
+    // generate node bindgens for cjs output
+    fs.mkdirSync(`./dist/cjs`, { recursive: true });
+    execSync(
+        `wasm-bindgen --target nodejs ../../target/wasm32-unknown-unknown/release-wasm/${
+            packagePrefix + pkg
+        }.wasm --out-dir ./temp/node/${pkg} --out-name ${pkg}`
+    );
 
-// prepare the dts
-let dts = fs.readFileSync(`./temp/node/${package}/${package}.d.ts`, {
-	encoding: 'utf-8'
-});
-dts = dts.replace(
-	`/* tslint:disable */
+    // encode wasm as base64 into a json for cjs that can be natively imported
+    // in js modules in order to avoid using fetch or fs operations
+    const wasmCjsBytes = fs.readFileSync(`./temp/node/${pkg}/${pkg}_bg.wasm`);
+    fs.writeFileSync(
+        "./dist/cjs/orderbook_wbg.json",
+        JSON.stringify({
+            wasm: Buffer.from(wasmCjsBytes, 'binary').toString('base64')
+        })
+    );
+
+    // prepare the dts
+    let dts = fs.readFileSync(`./temp/node/${pkg}/${pkg}.d.ts`, {
+        encoding: 'utf-8'
+    });
+    dts = dts.replace(
+        `/* tslint:disable */
 /* eslint-disable */`,
-	''
-);
-dts = '/* this file is auto-generated, do not modify */\n' + dts;
-fs.writeFileSync(`./dist/cjs/index.d.ts`, dts);
-fs.writeFileSync(`./dist/esm/index.d.ts`, dts);
+        ''
+    );
+    dts = '/* this file is auto-generated, do not modify */\n' + dts;
+    for (const dup of dups) {
+        const index = dts.indexOf(dup);
+        const lastIndex = dts.lastIndexOf(dup);
+        if (index === -1 || lastIndex === index) continue;
+        dts = dts.replaceAll(dup, "");
+        const start = dts.slice(0, index);
+        const end = dts.slice(index);
+        dts = start + dup + end;
+    }
+    fs.writeFileSync(`./dist/cjs/index.d.ts`, dts);
 
-// prepare cjs
-let cjs = fs.readFileSync(`./temp/node/${package}/${package}.js`, {
-	encoding: 'utf-8'
-});
-cjs = cjs.replace(
-	`const path = require('path').join(__dirname, '${package}_bg.wasm');
+    // prepare cjs
+    let cjs = fs.readFileSync(`./temp/node/${pkg}/${pkg}.js`, {
+        encoding: 'utf-8'
+    });
+    cjs = cjs.replace(
+        `const path = require('path').join(__dirname, '${pkg}_bg.wasm');
 const bytes = require('fs').readFileSync(path);`,
-	`
+        `
 const { Buffer } = require('buffer');
-const wasmB64 = require('../cjs/orderbook_wbg.json');
+const wasmB64 = require('./orderbook_wbg.json');
 const bytes = Buffer.from(wasmB64.wasm, 'base64');`
-);
-cjs = cjs.replace('const { TextEncoder, TextDecoder } = require(`util`);', '');
-cjs = '/* this file is auto-generated, do not modify */\n' + cjs;
-fs.writeFileSync(`./dist/cjs/index.js`, cjs);
+    );
+    cjs = cjs.replace('const { TextEncoder, TextDecoder } = require(`util`);', '');
+    cjs = '/* this file is auto-generated, do not modify */\n' + cjs;
+    fs.writeFileSync(`./dist/cjs/index.js`, cjs);
+}
+
+module.exports.buildEsm = function (pkg) {
+    // generate web bindgens for esm output
+    fs.mkdirSync(`./dist/esm`, { recursive: true });
+    execSync(
+        `wasm-bindgen --target web ../../target/wasm32-unknown-unknown/release-wasm/${
+            packagePrefix + pkg
+        }.wasm --out-dir ./temp/web/${pkg} --out-name ${pkg}`
+    );
+
+    // encode wasm as base64 into a json for esm that can be natively imported
+    // in js modules in order to avoid using fetch or fs operations
+    const wasmEsmBytes = fs.readFileSync(`./temp/web/${pkg}/${pkg}_bg.wasm`);
+    fs.writeFileSync(
+        `./dist/esm/orderbook_wbg.json`,
+        JSON.stringify({
+            wasm: Buffer.from(wasmEsmBytes, 'binary').toString('base64')
+        })
+    );
 
-// prepare esm
-let esm = fs.readFileSync(`./temp/web/${package}/${package}.js`, {
-	encoding: 'utf-8'
-});
-if (isTauriBuild) {
-	esm = esm.replace(
-	`export { initSync };
+    // prepare the dts
+    let dts = fs.readFileSync(`./temp/web/${pkg}/${pkg}.d.ts`, {
+        encoding: 'utf-8'
+    });
+    dts = dts.replace(
+        `/* tslint:disable */
+/* eslint-disable */`,
+        ''
+    );
+    dts = '/* this file is auto-generated, do not modify */\n' + dts;
+    for (const dup of dups) {
+        const index = dts.indexOf(dup);
+        const lastIndex = dts.lastIndexOf(dup);
+        if (index === -1 || index === lastIndex) continue;
+        dts = dts.replaceAll(dup, "");
+        const start = dts.slice(0, index);
+        const end = dts.slice(index);
+        dts = start + dup + end;
+    }
+    fs.writeFileSync(`./dist/esm/index.d.ts`, dts);
+
+    // prepare esm .js
+    let esm = fs.readFileSync(`./temp/web/${pkg}/${pkg}.js`, {
+        encoding: 'utf-8'
+    });
+    esm = esm.replace(`export { initSync };
 export default __wbg_init;`,
-	`import { Buffer } from 'buffer';
-import wasmB64 from '../esm/orderbook_wbg.json';
-const bytes = Buffer.from(wasmB64.wasm, 'base64');
+        `import { Buffer } from 'buffer';
+import wasmB64 from './orderbook_wbg.json';
+const bytes = Buffer.from(wasmB64.wasm, 'base64');\n
 initSync(bytes);`
-);
-} else {
-	esm = esm.replace(
-	`export { initSync };
-export default __wbg_init;`,
-	`import { Buffer } from 'buffer';
-import wasmB64 from '../esm/orderbook_wbg.json';
-const bytes = Buffer.from(wasmB64.wasm, 'base64');
-await __wbg_init(bytes);`
-);
+        );
+    esm = '/* this file is auto-generated, do not modify */\n' + esm;
+    fs.writeFileSync(`./dist/esm/index.js`, esm);
 }
-esm = '/* this file is auto-generated, do not modify */\n' + esm;
-fs.writeFileSync(`./dist/esm/index.js`, esm);
diff --git a/packages/orderbook/scripts/sizeCheck.js b/packages/orderbook/scripts/sizeCheck.js
new file mode 100644
index 0000000000..ecad981051
--- /dev/null
+++ b/packages/orderbook/scripts/sizeCheck.js
@@ -0,0 +1,11 @@
+const fs = require('fs');
+
+const SIZE_LIMIT = 8_388_608; // 8 MB binary
+
+module.exports.sizeCheck = function (pkg) {
+    // we only need to check size on web/esm
+    const wasmEsmBytes = fs.readFileSync(`./temp/web/${pkg}/${pkg}_bg.wasm`);
+    if (wasmEsmBytes.length > SIZE_LIMIT) {
+        throw new Error("ESM wasm size exceeds 8 MB limit!")
+    }
+}
diff --git a/packages/webapp/package.json b/packages/webapp/package.json
index 6ccfd3676c..fcae9426d5 100644
--- a/packages/webapp/package.json
+++ b/packages/webapp/package.json
@@ -6,8 +6,8 @@
 	"author": "Rain Open Source Software Ltd",
 	"private": true,
 	"scripts": {
-		"dev": "npm run build -w @rainlanguage/orderbook && vite dev",
-		"build": "npm run build -w @rainlanguage/orderbook && vite build",
+		"dev": "vite dev",
+		"build": "vite build",
 		"preview": "vite preview",
 		"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
 		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
diff --git a/tauri-app/package.json b/tauri-app/package.json
index ba9aa31d53..57bf4d94be 100644
--- a/tauri-app/package.json
+++ b/tauri-app/package.json
@@ -5,8 +5,8 @@
   "license": "LicenseRef-DCL-1.0",
   "author": "Rain Open Source Software Ltd",
   "scripts": {
-    "dev": "npm run build-tauri -w @rainlanguage/orderbook && vite dev",
-    "build": "npm run build-tauri -w @rainlanguage/orderbook && npm run build-bindings && vite build",
+    "dev": "vite dev",
+    "build": "npm run build-bindings && vite build",
     "preview": "vite preview",
     "check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
     "check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",