[Ipe-discuss] IPE 6.0 pre26 running slow on linux

Tony S Yu tonyyu at MIT.EDU
Wed May 10 05:02:09 CEST 2006

I think I've found the problem:

I just realized that all the files I tried to open were Ipe files 
created in windows (same Ipe version). If I open up a new file, or one 
that I created with Ipe in linux, everything works just fine.

But there is still something I don't understand going on: if I create a 
new Ipe file in windows with just a little bit of text and open it in 
linux, I don't have any problems -- I haven't gotten a chance to try 
anything more complicated yet. So far I've only gotten this slowness 
issue with 3 Ipe files that I created in windows awhile back -- not with 
new ones that I have made to test the problem.


Otfried Cheong wrote:
> Tony S Yu wrote:
>> I upgraded from IPE 6.0 pre 23 to pre 26 on linux (Kubuntu 5.10), and 
>> as a result, I had to upgrade to Qt 4.1.2. Since the upgrade, IPE has 
>> been running really slowly; there's a noticeable delay on all 
>> commands (about a second). 
> This might be the problem discussed before about double buffering (but I
> haven't used Qt 4.1.2. myself yet).  In "src/ipecanvas/ipecanvas.cpp",
> can you uncomment the line
>     setAttribute(Qt::WA_PaintOnScreen);
> (in IpeCanvas::IpeCanvas) and see whether this fixes the problem?
> In the next version this will be a user preference (because it seems
> impossible to make uniform decision for everyone).
>> Also occasionally, IPE will hang -- particularly when zoomed in and 
>> using splinegon with many points.
> This I haven't seen.  If you can reproduce it, please post a bug report.
> Otfried


Tony Yu
Hatsopoulos Microfluids Laboratory
Massachusetts Institute of Technology

office: (617) 452 - 3166
cell: (443) 538 - 4102
tonyyu at mit.edu

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