Kubuntu：程序启动缓慢 - 大约 4 秒

Question

即 KCalc 从命令到启动需要 4 秒。Kate 也一样。Libre Office Writer 启动画面立即出现。所以我尝试安装另一个图形驱动程序（INtel OO），但没有帮助。我确实检查了 /etc/hosts，没问题。.xession-errors 包含其中一些

QXcbConnection: XCB error: 3 (BadWindow), sequence: 16835, resource id:         92312108, major code: 18 (ChangeProperty), minor code: 0

在我启动“kate”之后：

kscreen: Primary output changed from KScreen::Output(Id: 68 , Name: "HDMI1" ) ( "HDMI1" ) to KScreen::Output(Id: 68 , Name: "HDMI1" ) ( "HDMI1" )
kscreen: Primary output changed from KScreen::Output(Id: 68 , Name: "HDMI1" ) ( "HDMI1" ) to KScreen::Output(Id: 68 , Name: "HDMI1" ) ( "HDMI1" )
kscreen.kded: Change detected
QXcbConnection: XCB error: 3 (BadWindow), sequence: 26563, resource id: 130023446, major code: 18 (ChangeProperty), minor code: 0
kscreen: Primary output changed from KScreen::Output(Id: 68 , Name: "HDMI1" ) ( "HDMI1" ) to KScreen::Output(Id: 68 , Name: "HDMI1" ) ( "HDMI1" )
kscreen: Primary output changed from KScreen::Output(Id: 68 , Name: "HDMI1" ) ( "HDMI1" ) to KScreen::Output(Id: 68 , Name: "HDMI1" ) ( "HDMI1" )
kscreen.kded: Change detected
kscreen: Primary output changed from KScreen::Output(Id: 68 , Name: "HDMI1" ) ( "HDMI1" ) to KScreen::Output(Id: 68 , Name: "HDMI1" ) ( "HDMI1" )
kscreen: Primary output changed from KScreen::Output(Id: 68 , Name: "HDMI1" ) ( "HDMI1" ) to KScreen::Output(Id: 68 , Name: "HDMI1" ) ( "HDMI1" )
kscreen.kded: Saving current config to file
kscreen.kded: Calculating config ID for KScreen::Config(0x2326d90)
kscreen.kded:   Part of the Id:  "bd0a13e9dbd6a6e0ce1ce255d4e55c33"
kscreen.kded:   Part of the Id:  "ea466ee9ba98ce5da7c4befbd68d6103"
kscreen.kded:   Config ID: "b38fa8b4e98d646d3928ac6c11d4d061"
kscreen.kded: Config saved on:      "/home/x/.local/share/kscreen/b38fa8b4e98d646d3928ac6c11d4d061"

当我在 shell 中启动 Kate 时，shell 中没有出现任何错误消息。

我该如何调试？是否有可能观察系统在启动 kde-app 时执行的操作？