diff --git a/compiler/integration-tests/package.json b/compiler/integration-tests/package.json
index 2e75ebc201e..798b7c55312 100644
--- a/compiler/integration-tests/package.json
+++ b/compiler/integration-tests/package.json
@@ -19,6 +19,7 @@
         "@nomicfoundation/hardhat-chai-matchers": "^2.0.0",
         "@nomicfoundation/hardhat-ethers": "^3.0.0",
         "@web/dev-server-esbuild": "^0.3.6",
+        "@web/dev-server-import-maps": "^0.2.0",
         "@web/test-runner": "^0.15.3",
         "@web/test-runner-playwright": "^0.10.0",
         "eslint": "^8.56.0",
diff --git a/compiler/integration-tests/test/mocks/os.js b/compiler/integration-tests/test/mocks/os.js
new file mode 100644
index 00000000000..32333568316
--- /dev/null
+++ b/compiler/integration-tests/test/mocks/os.js
@@ -0,0 +1 @@
+export const os = { cpus: () => new Array(4) };
diff --git a/compiler/integration-tests/web-test-runner.config.mjs b/compiler/integration-tests/web-test-runner.config.mjs
index 665ea262f99..4dfc96dd0a6 100644
--- a/compiler/integration-tests/web-test-runner.config.mjs
+++ b/compiler/integration-tests/web-test-runner.config.mjs
@@ -2,7 +2,8 @@ import { defaultReporter } from '@web/test-runner';
 import { summaryReporter } from '@web/test-runner';
 import { fileURLToPath } from 'url';
 import { esbuildPlugin } from '@web/dev-server-esbuild';
-import { playwrightLauncher } from "@web/test-runner-playwright";
+import { playwrightLauncher } from '@web/test-runner-playwright';
+import { importMapsPlugin } from '@web/dev-server-import-maps';
 
 let reporter = summaryReporter();
 const debugPlugins = [];
@@ -21,7 +22,7 @@ if (process.env.CI !== 'true' || process.env.RUNNER_DEBUG === '1') {
 
 export default {
   browsers: [
-    playwrightLauncher({ product: "chromium" }),
+    playwrightLauncher({ product: 'chromium' }),
     // playwrightLauncher({ product: "webkit" }),
     // playwrightLauncher({ product: "firefox" }),
   ],
@@ -29,6 +30,16 @@ export default {
     esbuildPlugin({
       ts: true,
     }),
+    importMapsPlugin({
+      inject: {
+        importMap: {
+          imports: {
+            // mock os module
+            os: '/test/mocks/os.js',
+          },
+        },
+      },
+    }),
     ...debugPlugins,
   ],
   files: ['test/browser/**/*.test.ts'],
diff --git a/tooling/noir_js_backend_barretenberg/src/index.ts b/tooling/noir_js_backend_barretenberg/src/index.ts
index d79b487c3cf..af03743eb2f 100644
--- a/tooling/noir_js_backend_barretenberg/src/index.ts
+++ b/tooling/noir_js_backend_barretenberg/src/index.ts
@@ -33,8 +33,18 @@ export class BarretenbergBackend implements Backend {
   /** @ignore */
   async instantiate(): Promise<void> {
     if (!this.api) {
+      if (typeof navigator !== 'undefined' && navigator.hardwareConcurrency) {
+        this.options.threads = navigator.hardwareConcurrency;
+      } else {
+        try {
+          const os = await import('os');
+          this.options.threads = os.cpus().length;
+        } catch (e) {
+          console.log('Could not detect environment. Falling back to one thread.', e);
+        }
+      }
       const { Barretenberg, RawBuffer, Crs } = await import('@aztec/bb.js');
-      const api = await Barretenberg.new({ threads: this.options.threads });
+      const api = await Barretenberg.new(this.options);
 
       const [_exact, _total, subgroupSize] = await api.acirGetCircuitSizes(this.acirUncompressedBytecode);
       const crs = await Crs.new(subgroupSize + 1);
diff --git a/tooling/noir_js_backend_barretenberg/src/types.ts b/tooling/noir_js_backend_barretenberg/src/types.ts
index 041e36fdf91..fac23030aad 100644
--- a/tooling/noir_js_backend_barretenberg/src/types.ts
+++ b/tooling/noir_js_backend_barretenberg/src/types.ts
@@ -5,4 +5,5 @@
 export type BackendOptions = {
   /** @description Number of threads */
   threads: number;
+  memory?: { maximum: number };
 };
diff --git a/yarn.lock b/yarn.lock
index ace7959279f..f5f3a29f08a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3951,6 +3951,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@import-maps/resolve@npm:^1.0.1":
+  version: 1.0.1
+  resolution: "@import-maps/resolve@npm:1.0.1"
+  checksum: 17ee033e26a0fd82294de87eae76d32b553a130fdbf0fb8c70d39f2087a3e8a4a5908970a99aa32bd175153efe9b7dfee6b7f99df36f41abed08c1911dbdb19c
+  languageName: node
+  linkType: hard
+
 "@isaacs/cliui@npm:^8.0.2":
   version: 8.0.2
   resolution: "@isaacs/cliui@npm:8.0.2"
@@ -6677,6 +6684,20 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@web/dev-server-import-maps@npm:^0.2.0":
+  version: 0.2.0
+  resolution: "@web/dev-server-import-maps@npm:0.2.0"
+  dependencies:
+    "@import-maps/resolve": ^1.0.1
+    "@types/parse5": ^6.0.1
+    "@web/dev-server-core": ^0.7.0
+    "@web/parse5-utils": ^2.1.0
+    parse5: ^6.0.1
+    picomatch: ^2.2.2
+  checksum: 15dabfa385f023bab70758b80cc09443455830799793c1a404a7230d90ebf60e40984a10d8a6ceea2afb8f057e90a9f7356a76f867d5e5a2eeacbc397e41535a
+  languageName: node
+  linkType: hard
+
 "@web/dev-server-rollup@npm:^0.4.1":
   version: 0.4.1
   resolution: "@web/dev-server-rollup@npm:0.4.1"
@@ -13416,6 +13437,7 @@ __metadata:
     "@nomicfoundation/hardhat-chai-matchers": ^2.0.0
     "@nomicfoundation/hardhat-ethers": ^3.0.0
     "@web/dev-server-esbuild": ^0.3.6
+    "@web/dev-server-import-maps": ^0.2.0
     "@web/test-runner": ^0.15.3
     "@web/test-runner-playwright": ^0.10.0
     eslint: ^8.56.0