[Qgis-user] Very slow performance with large SHP files, with over 200k objects

[Agustin Lobo]

Carson,

2011/3/8 Carson Farmer <carson.farmer at gmail.com>:
> Porting fTools to C++ is already under way, but it is extremely slow
> at the moment (due to my PhD!). If there are any C++ devs out there
> with an interest in speeding these operations up, please don't
> hesitate to contact me!
Great news, even if the progress is slow! Many thanks for the effort.

> My other comment, which is frequently given on the R mailing lists, is
> this: There are rarely any problems that can't be broken down into
> smaller components; if you have issues with visualizing/working with
> large vector layers, why not try sub-setting the layers into
> manageable pieces?
This is easier for raster layers, very cumbersome for vector layers.
On the other hand,
the current limitations make this approach very inconvenient (too many pieces!).

Agus


> Carson
>
> On Tue, Mar 8, 2011 at 6:16 PM, Agustin Lobo <alobolistas at gmail.com> wrote:
>> At least regarding the vector operations (ftools), it seems that the
>> slowness is because of python code. During
>> FOSS4G in Barcelona we raised the question of rewriting all that part in c++
>>
>> Agus
>>
>> 2011/3/7 Giovanni Manghi <giovanni.manghi at gmail.com>:
>>>
>>>> Agreed, this is a serious problem, and should be dealt with. There is a
>>>> ticket on this, please have a look to it.
>>>
>>> it is even worst when you try edit those vectors.
>>>
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>
>
>
> --
> Carson J. Q. Farmer
> ISSP Doctoral Fellow
> National Centre for Geocomputation
> National University of Ireland, Maynooth,
> http://www.carsonfarmer.com/
>