Public bug reported:

Using GTK3 progress bars with either Radiance or Ambiance Themes generates high 
CPU usage which is weird.
To reproduce the effect, I suggest to use xfce4-genmon-plugin calling a simple 
script with just the two following lines:

echo "10%"
#echo "<bar>10</bar>"

And to alternatively toggle the comment while monitoring CPU load. A clear 
offset should appear.
Using any other GTK3 theme do not generate this increase of CPU usage.

** Affects: ubuntu-themes (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: gtk3 progressbar xfce4-panel

** Description changed:

  Using GTK3 progress bars with either Radiance or Ambiance Themes generates 
high CPU usage which is weird.
  To reproduce the effect, I suggest to use xfce4-genmon-plugin calling a 
simple script with just the two following lines:
  
  echo "10%"
  #echo "<bar>10</bar>"
  
- And to alternatively toggle the comment while monitoring CPU load. An clear 
offset.
+ And to alternatively toggle the comment while monitoring CPU load. A clear 
offset should appear.
  Using any other GTK3 themes do not generates this increase of CPU usage.

** Description changed:

  Using GTK3 progress bars with either Radiance or Ambiance Themes generates 
high CPU usage which is weird.
  To reproduce the effect, I suggest to use xfce4-genmon-plugin calling a 
simple script with just the two following lines:
  
  echo "10%"
  #echo "<bar>10</bar>"
  
  And to alternatively toggle the comment while monitoring CPU load. A clear 
offset should appear.
- Using any other GTK3 themes do not generates this increase of CPU usage.
+ Using any other GTK3 theme do not generate this increase of CPU usage.

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https://bugs.launchpad.net/bugs/1852010

Title:
  Progress bar in the XFCE panel generates high CPU usage

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