PyQt5加载uic子窗口时界面卡顿问题求助

我已按照您的指导操作，但问题仍未解决：打开第二个游戏窗口时界面出现卡顿。我保留了if __name__ == "__main__"中的app = ...代码，仅在主文件中创建第二个窗口的调用变量。现将相关代码重新贴出供您审阅：

main.py代码片段： #

# pyttsx3 处理指令
elif 'game' in query:
    games_window_open = show_window("games", True)  # 通过win32检查游戏窗口是否已运行，未运行则返回False
# 首次打开时games_window_open为False
if games_window_open == False:
    second_window = UI_Games()

elif games_window_open:
    self.ai_dialogue_update.emit("已有一个游戏窗口正在运行")
    speak("已有一个游戏窗口正在运行")

游戏窗口文件代码： #

from PyQt5.QtWidgets import QMainWindow, QApplication, QPushButton
from PyQt5 import uic
from PyQt5.QtCore import QThread
import sys

# 忽略这些小类，它们是可从UI子窗口中以线程方式运行的游戏
class Snake(QThread):
    def start_game(self):
        import Games.sanke_game


class Space(QThread):
    def space(self):
        import Games.space_invader


class Target(QThread):
    def target(self):
        import Games.target_practice

# 子窗口类UI_Games
class UI_Games(QMainWindow):
    def __init__(self):
        super(UI_Games, self).__init__()

        # 加载UI文件
        uic.loadUi("Resources\\UI_files\\game_window_UI.ui", self)

        # 定义控件
        self.snakeGame = self.findChild(QPushButton, "snakeGame")
        self.targetGame = self.findChild(QPushButton, "targetGame")
        self.guessGame = self.findChild(QPushButton, "guessGame")
        self.spaceGame = self.findChild(QPushButton, "spaceGame")
        self.ticTacToeGame = self.findChild(QPushButton, "ticTacToeGame")

        self.snakeGame.clicked.connect(lambda: self.game_choose("snake"))
        self.targetGame.clicked.connect(lambda: self.game_choose("target"))
        self.guessGame.clicked.connect(lambda: self.game_choose("guess"))
        self.spaceGame.clicked.connect(lambda: self.game_choose("space"))
        self.ticTacToeGame.clicked.connect(lambda: self.game_choose("tic-tac-toe"))

        
        # 显示窗口
        self.show()

    # 选择游戏的函数
    def game_choose(self, choice):
        if choice == "target":
            self.space_worker = Target()
            self.space_worker.target()
        
        elif choice == "snake":
            self.snake_worker = Snake()
            self.snake_worker.start_game()

        elif choice == "guess":
            pass

        elif choice == "tic-tac-toe":
            pass

        elif choice == "space":
            space_worker = Space()
            space_worker.space()


if __name__ == "__main__":
    app = QApplication(sys.argv)
    UIWindow = UI_Games()
    app.exec_()

卡顿界面截图： #

内容的提问来源于stack exchange，提问作者user20084690