PyQt5 - приложение 'не отвечает', при запуске иного процесса из другого файла

часть кода:

class AutoAdditionProfilesWindow(QWidget):
def __init__(self, main_window=None):
    super().__init__()
    self.setWindowTitle("Create Profile")
    self.setGeometry(200, 200, 500, 100)

    self.layout = QFormLayout()
    self.setLayout(self.layout)

    self.cookies_input = QPushButton("Choose Files")
    self.cookies_input.clicked.connect(self.choose_cookies_files)
    self.layout.addRow(QLabel("Choose Files:"), self.cookies_input)

    self.save_button = QPushButton("start")
    self.save_button.clicked.connect(self.start)
    self.layout.addWidget(self.save_button)

    self.file_path = "./files/profiles_info.json"

def choose_cookies_files(self):
    options = QFileDialog.Options()
    self.files, _ = QFileDialog.getOpenFileNames(self, "Select Cookies Files", "", "Text Files (*.txt);;All Files (*)", options=options)
    if self.files: 
        self.cookies_input.setText(f"{len(self.files)}")

def start(self):

    ##=============================================##
    ##=============================================##
    

    from find_auth_keys import find_keys

    self.list_of_tokens = ["a375a9d14d00431052b4d668d7501d7fa243fce3"]

    text = QLabel("finding keys.")
    self.layout.addWidget(text)

    self.progress = QProgressBar()
    self.progress.setVisible(True)
    self.progress.setMaximum(len(self.files))
    self.layout.addWidget(self.progress)

    self.progress.setValue(self.progress.value() + 1)
    for index, path in enumerate(self.files):
        self.progress.setValue(self.progress.value() + 1)
        
        keys = find_keys(path, self)

        for key in keys:
            self.list_of_tokens.append(key)

    ##=============================================##
    ##=============================================##

    text.setText("checking profiles.")
    self.layout.removeWidget(self.progress)
    self.progress.deleteLater()

    self.progress = QProgressBar()
    self.progress.setVisible(True)
    self.progress.setMaximum(len(self.list_of_tokens))
    self.layout.addWidget(self.progress)

    self.progress.setValue(self.progress.value() + 1)

    chunk_size = 6
    profiles_queue = [self.list_of_tokens[i:i + chunk_size] for i in range(0, len(self.list_of_tokens), chunk_size)]

    try:
        for profile in profiles_queue:
            from main_module import Application

            Application([], {}).check_cookies([profile], self)
    except Exception as e:
        print(e)

    print(self.list_of_tokens)


    ##=============================================##
    ##=============================================##

    text.setText("adding profiles.")
    self.layout.removeWidget(self.progress)
    self.progress.deleteLater()

    self.progress = QProgressBar()
    self.progress.setVisible(True)
    self.progress.setMaximum(len(self.list_of_tokens))
    self.layout.addWidget(self.progress)

    self.progress.setValue(self.progress.value() + 1)
    for key in self.list_of_tokens:
        unique_code = self.generate_unique_code()
        profile_key = f"profile_{unique_code}"

        profile_data = {
            "name": profile_key,
            "cookies": {"name": "auth_token", "value": f"{key}", "path": "/", "domain": ".x.com"},
            "proxy": "",
            "notes": "",
            "tags": ""
        }

        with open(self.file_path, 'r') as file:
            data = json.load(file)

        data[profile_key] = profile_data

        with open(self.file_path, 'w', encoding="utf-8") as file:
            json.dump(data, file, indent=4)
        
        self.progress.setValue(self.progress.value() + 1)

def generate_unique_code(self):
    return str(uuid.uuid4())

как сказал ранее, программа "не отвечает", (как я понимаю) когда запускается процесс с другого файла. А мне важно, как минимум, сделать прогрес бар.

пробовал оптимизировать - не помогло