Problem description: Extremely slow handling of larger tables. Steps to reproduce: 1. Create new presentation 2. Add a table with 20 rows and 20 columns 3. Try moving or resizing it Current behavior: With a modern fast worstation pc, it takes >10seconds just to do basic operations like move or resize. Try adding a table of 40x40 and it takes forever (almost 2 min on my fast pc) just to place it. I initially thought it was a crash until I investigated further. Expected behavior: Microsoft Powerpoint does it in seconds, even the 40x40. Platform (if different from the browser): Browser: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)
reproducible with LO 3.6.4.3. (Win7 Home, 64bit, i5, 4 GB RAM) I can confirm that it takes quite long to insert (approx. 10 seconds) and to move or resize the 20x20 table (20 to 30 seconds) or LO hangs even up. To insert a 40x40 table takes more 2 1/2 minutes.
Confirmed on OS X with LO 4.0.3.3. Moving, resizing or changing style of tables are very slow. Changing the style of a 10x25 table on a 2 GHz Intel Core 2 Duo machine takes 13 seconds with 100 % processor usage. Possibly related to bug 38892.
Confirmed on Debian "Squeeze" 6.0.7, LO 3.5.4.2. Another user confirmed the same issue on Debian "Wheezy" (current stable), which has the same version of LO packaged. Inserting a 10x25 table takes ~6s, changing the style in Table Design takes ~19s, moving the table by dragging takes above 10s (from release of mouse button to redraw of the table) on an i5-2410M based laptop (2.3 GHz, 2 cores). One core is fully occupied during the period of unresponsiveness. Bug 46917 seems related as well.
Created attachment 80395 [details] Shark profile of LibreOffice when changing style of table in Impress I created a new Impress file and inserted a table of size 20x20 on an empty slide. I started Shark profiling and with the table selected, from "Taulukon suunnittelu" ("Table design" I think) I chose a different page style. The file contains the call stack as recorded by Shark, with the heaviest calls sorted to be on top.
This is true for moving any object, no matter how simple. For example: 1. New Impress Presentation. One slide (using the default master). 2. Create one text box, and type a few words in it. 3. Move the box with the mouse. It's really quite sluggish, even on a fast PC. The screen repaints at about 5Hz. 4. Now try creating an empty 5x25 table, and moving that. The screen redraws about every 5 seconds. 5. Textboxes with 20 lines of text are also pretty bad. It feels a bit like X11-forwarding over a dial-up modem! I'm using 4.0.2.2 in Ubuntu Raring, 64-bit.
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