1. Open or create a Calc document.
2. Maximise the window.
3. Drag-select a large area of cells (no need to go outside the visible window).
4. Press Ctrl-c to copy those cells & start the 'marching ants' border around them.
5. Create a new Calc document and maximise its window, or otherwise bring up a maximised window that covers the first Calc window.
6. Issue: Even though the first Calc window is no longer displayed, the Xorg CPU usage is slightly increased by the 'marching ants' effect. The %CPU increase is more noticeable on slow computers.
LibreOffice 184.108.40.206 on Ubuntu 13.04.
This bug is probably related to bug 73841 but suggests an optimisation that might not be obvious from that bug (not having X animate the "marching ants" when the window isn't shown).
I have noticed this in the Windows version as well, but with very noticeable effects on the speed of other running programs. This is on a system with a Celeron D processor.
TESTING with LO 220.127.116.11 + Ubuntu 14.04
(In reply to dg1727 from comment #0)
> 1. Open or create a Calc document.
> 2. Maximise the window.
> 5. Create a new Calc document and maximise its window, or otherwise bring
> up a maximised window that covers the first Calc window.
With 2 Calc windows open and maximized (with nothing in them except a small label in A1 to tell them apart, X.org CPU usage as reported by top was:
> 3. Drag-select a large area of cells (no need to go outside the visible
> 4. Press Ctrl-c to copy those cells & start the 'marching ants' border
> around them.
> 6. Issue: Even though the first Calc window is no longer displayed, the
> Xorg CPU usage is slightly increased by the 'marching ants' effect. The
> %CPU increase is more noticeable on slow computers.
With one of the windows fully selected (A1:P38 -- hey, that's a can opener! :-), copied (with CTRL-C), and hidden behind the other one, X.org CPU usage was around:
So I'll call this one CONFIRMED.
Status -> NEW
In fact, I wouldn't call that a "slight increase" in X.org CPU usage -- it's a significant increase, so:
Whiteboard -> perf
Migrating Whiteboard tags to Keywords: (perf)
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I noticed an increase of cpu usage up to 25% for very few seconds.