[Qgis-developer] Aruns work: hierarchical SVG symbol display issue

[Andreas Neumann]

 Hi,

 I noticed that the cache seems to better work if a symbol was already 
 an SVG symbols (only 4-5 seconds) whereas, if a symbol was e.g. a simple 
 marker before and I change it to an SVG symbol I have to wait 8-9 
 seconds for the list to load.

 Andreas

 On Thu, 23 Aug 2012 13:59:42 +0200, Andreas Neumann wrote:
> Hi Arun,
>
> Thanks for your reply.
>
> On Thu, 23 Aug 2012 16:53:10 +0530, aruntheguy at gmail.com wrote:
>> Hello Neumann,
>>
>> On Thu, Aug 16, 2012 at 7:05 PM, Andreas Neumann  wrote:
>>
>>> The only issue I have with the current solution is that it takes a
>>> long time (in my case about 10 seconds) to load all the symbols
>>> (hundreds of them in my case). Wouldn't it be faster to only load
>>> the first folder or even better no symbols at all until the user is
>>> opening/clicking on one of the folders?
>>
>> The default display of all symbols is to provide a way to see all 
>> the
>> symbols when no folder is clicked. I guess that makes it a lengthy.
>
> ok - is there anything we can do here? Add an option not to load all
> symbols by default?
>
> I expect the symbol list to grow larger and larger, and speed is an
> issue here.
>
> With my setup I have to wait around 10 seconds when I load the SVG
> symbols for the first time, when loading it subsequently in the same
> session it is maybe 1 second faster (8-9 seconds). Certainly not a 
> lot
> of speed gain from the caching?
>
> As my list of symbol grows I expect the number of symbols to double
> or triple, which would mean I would have to wait 20-30 seconds each
> time I want to select an SVG symbol.
>
> Is there really no faster way to implement this? Only load the folder
> with symbols I am interested in? When I work on a project around gaz
> and water I am not interested in symbols for leisure activities at 
> all
> ...
>
>>> The other question is: are those symbols cached, once they are
>>> loaded? I don't see any speed increases the second time I load 
>>> these
>>> SVG symbols.
>>
>> Yes, there is a SVG cache being created and reused. You should be
>> definitely seeing reduced load times on second loads. I am a bit 
>> lost
>> how that doesn't occur.
>
> really strange. I don't see a lot of speed gain from the cache. I
> can't even see if there is an advantage of the cache at all.
>
>> But note that the cache is not persistent, so it cannot remember
>> between the sessions.
>
> thats ok.
>
> Thanks for any additional information / ideas around this problem.
>
> Andreas

-- 
 --
 Andreas Neumann
 Böschacherstrasse 10A
 8624 Grüt (Gossau ZH)
 Switzerland