应用程序卡顿

当我在命令shell窗口输入连接对象时，如 ssh root@192.16 时，窗口会卡住一段时间。

Start by reproducing the pause in the command shell window with the reported SSH input, such as `ssh root@192.16`, and record how long it lasts and whether it recovers. Trace the command-shell handling for connection commands; done means the same input no longer causes the window to become unresponsive, with regression coverage if the relevant test entry point is found.

Written by the indexing model from the issue text.