diff --git a/packages/connect/src/api/firmware/verifyEntropy.ts b/packages/connect/src/api/firmware/verifyEntropy.ts
index b6344f539e8..355a77fea0e 100644
--- a/packages/connect/src/api/firmware/verifyEntropy.ts
+++ b/packages/connect/src/api/firmware/verifyEntropy.ts
@@ -1,6 +1,6 @@
 import { entropyToMnemonic, mnemonicToSeed } from 'bip39';
 import { hmac } from '@noble/hashes/hmac';
-import { pbkdf2 } from '@noble/hashes/pbkdf2';
+import { crypto } from '@noble/hashes/crypto';
 import { sha256 } from '@noble/hashes/sha256';
 import { randomBytes } from '@noble/hashes/utils';
 
@@ -21,16 +21,34 @@ const BASE_ITERATION_COUNT = 10000;
 const ROUND_COUNT = 4;
 
 // https://github.com/trezor/python-shamir-mnemonic/blob/master/shamir_mnemonic/cipher.py
-const roundFunction = (i: number, passphrase: Buffer, e: number, salt: Buffer, r: Buffer) => {
+const roundFunction = async (i: number, passphrase: Buffer, e: number, salt: Buffer, r: Buffer) => {
     const data = Buffer.concat([Buffer.from([i]), passphrase]);
     const iterations = Math.floor((BASE_ITERATION_COUNT << e) / ROUND_COUNT);
 
-    const result = pbkdf2(sha256, data, Buffer.concat([salt, r]), {
-        c: iterations,
-        dkLen: r.length,
-    });
-
-    return Buffer.from(result);
+    // '@noble/hashes/pbkdf2' takes ~ 8sec. in the web build
+    // const result = pbkdf2(sha256, data, Buffer.concat([salt, r]), {
+    //     c: iterations,
+    //     dkLen: r.length,
+    // });
+
+    // Nodejs only
+    // return crypto.pbkdf2Sync(data, Buffer.concat([salt, r]), iterations, r.length, 'sha256');
+
+    // Nodejs + WebCrypto equivalent
+    const { subtle } = crypto as Crypto;
+    const key = await subtle.importKey('raw', data, 'PBKDF2', false, ['deriveBits']);
+    const bits = await subtle.deriveBits(
+        {
+            name: 'PBKDF2',
+            hash: 'SHA-256',
+            salt: Buffer.concat([salt, r]),
+            iterations,
+        },
+        key,
+        r.length * 8,
+    );
+
+    return Buffer.from(bits);
 };
 
 // https://github.com/trezor/python-shamir-mnemonic/blob/master/shamir_mnemonic/cipher.py
@@ -48,7 +66,7 @@ const xor = (a: Buffer, b: Buffer) => {
 
 // https://github.com/trezor/python-shamir-mnemonic/blob/master/shamir_mnemonic/cipher.py
 // simplified "decrypt" function
-const entropyToSeedSlip39 = (encryptedSecret: Buffer) => {
+const entropyToSeedSlip39 = async (encryptedSecret: Buffer) => {
     const iterationExponent = 1;
     // const identifier = 0;
     // const extendable = true,
@@ -59,7 +77,7 @@ const entropyToSeedSlip39 = (encryptedSecret: Buffer) => {
     let l = encryptedSecret.subarray(0, half);
     let r = encryptedSecret.subarray(half);
     for (let round = ROUND_COUNT - 1; round >= 0; round--) {
-        const f = roundFunction(round, passphrase, iterationExponent, salt, r);
+        const f = await roundFunction(round, passphrase, iterationExponent, salt, r);
         const rr = xor(l, f);
         l = r;
         r = rr;