可能有误
https://docs.microsoft.com/zh-cn/dotnet/api/system.windows.forms.systeminformation.menushowdelay?view=netframework-4.7
HKEY_CURRENT_USER\Control Panel\Desktop
MenuShowDelay
参考资料:
https://jingyan.baidu.com/article/d621e8da454f5a2864913f6d.html