Maybe you're using a compositing window manager? Everything is still ok here with Ubuntu 14.04 and the gnome-flashback session (metacity window manager without effects).
If you think that graphics in general are slower, and it's not a window-manager/compositing issue, then try x11perf, gtkperf or something similar to compare the results with the older installation. On 17/02/2015 03:54 μμ, Michal Rybárik wrote: > Hi Helmut, > > we have same performance problems as you. Everything was working well on > older distributions for long years (we used OpenSuse 11.3 past years). > But when installing newer distributions (Kubuntu 14.04, CentOS 6), > graphics is very very slow, on the same hardware and same network as > before. Very simple graphics changes now uses 100% CPU on 1GHz thin > client, and load goes to 30.00 and more in a short while. Thin client > with dualcore i5 CPU is now slower, than 350 MHz PII was before. > > There are some simple graphics operations that kills performance very > drastically - for example in OpenOffice Calc if user selects more cells > and press Ctrl-C (copy), moving dashes are displayed around selection, > and these moving dashes makes thin client almost unresponsive (because > of very high CPU usage). > > Setting QT_GRAPHICSSYSTEM=native partially fixes problem for QT > applications. Fullscreen Konsole window is redrawn in ~5 seconds without > this setting, and in <1 second with it. But we are unable to fix other > operations (for example OpenOffice selection mentioned above). > > I can say that this appies to > - all graphics chipsets that we have in thinclients (SiS, Radeon 280, > intel HD 4000), no difference between chipsets > - both LDM and XDMCP method of communication > - both Kubuntu 14.04 and Centos 6 > > We are trying to find solution for more than 4 months, but still no > luck. All suggestions are welcome... > > -- > Michal Rybarik > ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=190641631&iu=/4140/ostg.clktrk _____________________________________________________________________ Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: https://lists.sourceforge.net/lists/listinfo/ltsp-discuss For additional LTSP help, try #ltsp channel on irc.freenode.net
