F24 → F25 upgrade made my system sluggish (input lag?)
I have upgraded my Fedora installation from 24 to 25. Since then, things
that were done instantly before *sometimes* take half a second now.
Examples are:
- Switching the workspace in Awesome WM
- Typing something into the terminal (Konsole, fish shell)
- Pasting with the mousewheel (e.g. into Freemind, a Java Mindmap
software)
- Starting a new terminal window
- Performing an action in Firefox
I do not quite know where this is coming from. Since it impacts a lot of
programs from various toolkits (Qt, GTK, Java), I am not really sure
what is going on. This regression is not catastrophic but rather
annoying.
When I try to select some text with the mouse, the mouse button
sometimes get “stuck” and it selects much more text than I wanted.
Overal this feels like a massive input lag at times.
My display manager is LightDM, I use Awesome WM and a bunch of KDE
programs. `htop` does not show anything out of the ordinary. The idle
load is at around 2%
How could I diagnose this regressions? There are no issues in
`journalctl -f` whenever there is a short lag. Any log that might help?
---
I have posted this [here](http://unix.stackexchange.com/q/328479/8251)
already but did not get any helpful feedback. That is why I now ask
here.