You can use this method to create the wallet faster:
try {
    ECKeyPair ecKeyPair = Keys.createEcKeyPair();
    BigInteger privateKeyInDec = ecKeyPair.getPrivateKey();
    String sPrivatekeyInHex = privateKeyInDec.toString(16);
    WalletFile aWallet = Wallet.createLight(UUID.randomUUID().toString(), ecKeyPair);
    String sAddress = aWallet.getAddress();
} catch (CipherException e | InvalidAlgorithmParameterException e | NoSuchAlgorithmException e | NoSuchProviderException e) {
    //
}