| Terrible scrolling and typing performance on Kubuntu 15.04 [message #1693951] |
Wed, 29 April 2015 12:53  |
 Emond Papegaaij
Messages: 4
Registered: April 2015 |
Junior Member |
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Hi,
After upgrading my system from Kubuntu 14.10 to 15.04, I'm having issues with scrolling and typing being unbelievably slow in Eclipse. When slow, an editor in Eclipse only scrolls about 1 line per second and typed characters appear in about the same rate. Luckily, this only happens once or twice per hour, and switching between applications (ALT-Tab) seems to fix the issue most of the time. Eclipse seems to be the only application effected by this issue, other applications run fine.
I performed quite some debugging trying to find the cause of this. I suspect it is related to the NVidia driver, with Eclipse running on an external 4k screen. The problems do not occur when the 4k display is disconnected and Eclipse is running on the 3k laptop screen. Nevertheless, only Eclipse is having issues on this 4k screen, so it must also be something specific to Eclipse.
I've attached Yourkit to collect some profiling statistics, but it seems this part is not recorded in the profiler, as I could not find anything related to the display in the profiling output.
After some experimentation in Eclipse, I found out that only the part in which the cursor is shown is slow. I can scroll fine through a very large file, but as soon as I reach the cursor, scrolling almost comes to a halt. The settings related to the cursor in the editors did not make any difference.
At the moment I'm at a loss to what is causing this, and am out of options on how to fix it. What could be causing this strange behavior? Is there anything else I might try?
Best regards,
Emond Papegaaij
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| Re: Terrible scrolling and typing performance on Kubuntu 15.04 [message #1694597 is a reply to message #1694058] |
Wed, 06 May 2015 14:16  |
Emond Papegaaij
Messages: 4
Registered: April 2015 |
Junior Member |
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After some more testing, I found that the problem is related to Google Chrome. Scrolling and typing is only slow when Chrome is open on the same screen as the Eclipse editor is on. I've got Eclipse split across 2 screens, with the editor on the 4k screen and the console on my laptop screen. When I place Chrome on the 4k screen (even if it's behind Eclipse), scrolling is slow, when I move it to the laptop's screen, or my 3rd screen, scrolling is fast. When I switch the eclipse editor and console windows (so the editor is now on my laptop's screen), scrolling is only slow when Chrome is on my laptop's screen. With Chrome closed, scrolling is fast.
I don't know what makes Chrome any different from, for example Firefox, and the Eclipse editor from Kate, but it seems Chrome and the Eclipse editor have a nasty interaction.
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