[OpenJDK 2D-Dev] Speed of drawPolyline on JDK11

Philip Race philip.race at oracle.com
Wed Oct 10 15:41:01 UTC 2018

  On 10/10/18, 6:07 AM, Peter Hull wrote:
> On Wed, Oct 10, 2018 at 1:21 PM Peter Hull<peterhull90 at gmail.com>  wrote:
>> -Dsun.java2d.uiScale=1.0
>> And this does make it fast again for me (paint time<  0.1sec)!

Which would sound like drawing wide lines on the software pipeline is 
it down which makes sense except the next statement potentially 
invalidates that :
> Also I tried on an older system with "Intel HD Graphics 4600" and it
> did not have the slow down problem. So it seems to be quite specific
> to my system.
Did that older system actually have UI scaling ?
What was the uiScale factor you saw on your "slow" system and what
is it on the no-slowdown system ?

In other words does


even change the physical size of the window on JDK 9/10/11 ?

Measure the actual pixels by using a ruler on your screen and  of
course you'll need to know the screen resolution you have in use
to do the calculation :

Screen width in pixels  X window width in inches / screen width in inches


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