Re: JScrollPane not scrolling smoothly on fast computer

Posted by e d p... on 11. May 2015

On Saturday, May 9, 2015 at 2:29:14 PM UTC-4, Knute Johnson wrote:




I've got some software running at a client's place for almost 10 years.
It was running under Windows XP and I think must have been originally
compiled with Java 5 and then later Java 6. The program had been
running fine for years but the hardware is starting to give out. At one
site we upgraded to a modern desktop with Windows 7. We started
noticing some issues with JScrollPanes with lots of JComponents in them
not scrolling smoothly. The new computers were considerably more
powerful than their predecessors but the performance sucked. We were
forced to use Java 7 or new so we used 8 but were still not happy with
performance but couldn't figure out what to do about it.



Just this week we are preparing a new desktop to run some new software
and the old software as some systems are being combined and upgraded.
The old software that was running under XP on an older desktop now
started having the scrolling issues on the new computer. The new
computer is 4 core, lots of memory, much faster processor and running
Windows 8. This was driving everybody crazy so I started looking around
to see if I could find something that would fix it.



In the end, it turns out that Java 8 running on Windows 8 on this
computer was not using the OpenGL pipeline for 2D drawing. I don't
really understand how all that works but manually turning it on on the
command line fixed our sticky scrolling problem. Just add
-Dsun.java2d.opengl=True to the command line and it's back to normal.



If anybody knows anything about how the DirectDraw and OpenGL and all
this works or can point me to a good article about it on Java 8 I would
appreciate it greatly.



Hopefully this will help somebody with the same problem avoid all the
hassle and blame that their software is bad in the future.





Knute Johnson




As far as I know all my scrollpanes are scrolling smooth. Do you have sample code that shows a problem?


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