Re: JScrollPane not scrolling smoothly on fast computer

Posted by Knute... on 12. May 2015

On 5/11/2015 12:59, [email protected] wrote:




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?




I've not been able to duplicate it, just fix it.





Knute Johnson


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