https://bugs.documentfoundation.org/show_bug.cgi?id=65046
--- Comment #6 from René Genz <liebundar...@freenet.de> ---
Calc experiences slow downs with charts
To recreate:
- open Calc and create small data set: rows: 0 to 2 in 0.001 steps
(approximately 2000 rows); 5 columns, all start at 0, but have different
increments
- select all data points from data set
- create chart: Chart Type=XY (Scatter) -- Points and Lines -- [Finish]
- GUI of LibreOffice considerably slows down after creation of graph
If chart is out of view, GUI is very fast again.
In LibreOffice 4.4.4.3 (distributed with Fedora 22) moving view to different
rows is:
- slow, if complete chart is in view
- slow, if chart is partly visible
- fast, if chart is not in view
At least with version 5.1.x drawing speed has improved for me.
In LibreOffice 5.1.5.2 (distributed with Fedora 24) and in LibreOffice 5.2.0.4
(tested with Flatpak on Fedora 24) moving view to different rows is:
- fast, if complete chart is in view
- slow, if chart is partly visible
- fast, if chart is not in view
It seems the whole chart is redrawn, if part of it is visible. Then again if
more is visible.
This results in slow work with those charts.
Maybe the chart can be used from memory all time and only be redrawn, if its
data has been changed?
On the same machine (Intel Core 2 Duo E8500 @ 3.16GHz; 4 GB RAM; GeForce 9500
GS) Microsoft Office 2010 32 bit on Windows 7 32 bit is fast in all 3 cases.
LibreOffice on Windows on the same machine shows the behaviour described above.
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