在鸿蒙中使用后字符串长度3000+，加密超过4秒怎么处理？

项目中使用DES和TripleDES混合使用加密，发现数据长度3000+以上偶尔出现卡死情况。
核心代码：

//加密核心代码
        let desXor = this.xOr(dataBlock[0], iv);
        for (let i = 1; i < blockCount; i++) {
            let des = this.encryptDES_CBC(desXor, leftKey, this.ZERO_IVC);
            desXor = this.xOr(dataBlock[i], byteUtils.hexStrToBytes(des));
        }
        desXor = this.encrypt3DES_CBC(desXor, key, this.ZERO_IVC);
        //desXor为最终加密后的数据

//处理数据
    xOr(b1, b2) {
        console.log('xOr --------start'+Date.now());
        let tXor = new Uint8Array(new ArrayBuffer(Math.min(b1.length, b2.length)));
        for (let i = 0; i < tXor.length; i++) {
            tXor[i] = b1[i] ^ b2[i]; // 异或(Xor)
        }
        console.log('xOr --------end'+Date.now());
        return tXor;
    }

//des加密
encryptDES_CBC(data, key, iv) {
        console.log('encryptDES_CBC --------start'+Date.now());
        var keyHex = byteUtils.bytesToHexStr(key);
        var ivHex = byteUtils.bytesToHexStr(iv);
        var dataHex = byteUtils.bytesToHexStr(data);

// console.log("encryptDES_CBC", dataHex, keyHex, ivHex);
        var encrypted = CryptoJS.DES.encrypt(
            CryptoJS.enc.Hex.parse(dataHex),
            CryptoJS.enc.Hex.parse(keyHex), {
                iv: CryptoJS.enc.Hex.parse(ivHex),
                mode: CryptoJS.mode.CBC,
                padding: CryptoJS.pad.NoPadding
            });
        var encryptedHex = encrypted.ciphertext.toString();
        // console.log("result = ", encryptedHex);
        console.log('encryptDES_CBC --------end'+Date.now());
        return encryptedHex;
    }

//3des加密
    encrypt3DES_CBC(data, key, iv) {
        console.log('encrypt3DES_CBC --------start'+Date.now());
        var keyHex = byteUtils.bytesToHexStr(key);
        var ivHex = byteUtils.bytesToHexStr(iv);
        var dataHex = byteUtils.bytesToHexStr(data);
        // console.log("encrypt3DES_CBC", dataHex, keyHex, ivHex);
        var encrypted = CryptoJS.TripleDES.encrypt(
            CryptoJS.enc.Hex.parse(dataHex),
            CryptoJS.enc.Hex.parse(keyHex), {
                iv: CryptoJS.enc.Hex.parse(ivHex),
                mode: CryptoJS.mode.CBC,
                padding: CryptoJS.pad.NoPadding
            });
        var encryptedHex = encrypted.ciphertext.toString();
        // console.log("result = ", encryptedHex);
        console.log('encrypt3DES_CBC --------end'+Date.now());
        return encryptedHex;
    }

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