Public bug reported:

Ubuntu 16.04
4.4.0-77-generic #98-Ubuntu SMP Wed Apr 26 08:34:02 UTC 2017 x86_64 x86_64 
x86_64 GNU/Linux
Nvida proprietary drivers

-What happens-

Since an upgrade to 4.4.0-77-generic kernel, the following things are
very slow to register (more than 10 seconds):

- Hot keys e.g. CTRL+ALT+T (terminal) - takes a long time for the terminal 
window to appear
- Thunderbird e-mail password prompt - Takes a long time to popup
- Encrypted drive password prompts and mounting

-What expected (used to happen) -
All dialogues pop up or register within a few seconds

-Notes-
Could be related to Nvidia drivers, which I had to uninstall and reinstall 
after the kernel upgrade.

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1688756

Title:
  password prompts and hotkeys slow to display

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