Yesterday, I upgraded my Lenovo Thinkpad X1 Carbon (2013) from Ubuntu 14.04 to Ubuntu 14.10. Since then, everything lags, from applications when opened (or 'drawn back in the background' for an overview of all open applications) to password entry on log-on. Even Google Chrome: youtube videos stutter. Also, when typing this, I feel a bit of a lag. Does anybody experience the same? Maybe under different hardware? [I used the standard software updater to update]
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I have a new carbon. I had slow redrawing of windows and other problems, although no particular problem with video. Fixed with: https://wiki.archlinux.org/index.php/Intel_graphics#SNA_issues
If you are experience issues with SNA, try using UXA instead, which can be done by creating an X configuration file containing the following:/etc/X11/xorg.conf.d/20-intel.conf
Section "Device" Identifier "Intel Graphics" Driver "intel" Option "AccelMethod" "uxa" EndSection
EDIT: DO NOT USE THIS SOLUTION. SNA has been fixed. Upgrade your kernel (at least 4.0 probably) and video card drivers (>=2.99.917 i think) instead.
user3113723
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Did you enable and allocate enough of a swap partition to be used as virtual memory when your RAM fills up?
See the source below to increase or create some swap space if you haven't. If it's still a problem then my guess would be it's a driver issue.
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I had the same problem too back when I had 14.04 though once I reinstalled Ubuntu it worked perfectly. Basically try reinstalling Ubuntu or either try checking out graphics drivers and try install the ones tailored for your graphics instead of using the default Xorg drivers.
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I recently updated to 14.10 too. I'm using a lenovo ideapad and it has worked fine. To fix your problem I would recommend changing startup applications, lowering swappiness, and other minor speed fixed you can find on google. If this dose not work I would suggest making a Ubuntu 14.10 bootable USB and completely reinstalling your operating system. Good luck!
