I found a reference to a similar discussion from the past:
https://pharo.fogbugz.com/f/cases/17403/Creating-Forms-from-PNGs-is-very-slowMatteo,
This is part of what I wrote (for a smaller PNG):
'
http://pharo.org/files/pharo.png' asZnUrl saveContentsToFile: 'pharo.png'.
'pharo.png' asFileReference size. "34696"
[ Form fromFileNamed: 'pharo.png' ] benchFor: 10 seconds.
"a BenchmarkResult(615 iterations in 10 seconds 14 milliseconds. 61.414 per second)"
"0.016282926s per execution"
FLSerializer serialize: (Form fromFileNamed: 'pharo.png') toFileNamed: 'pharo.form.fuel'.
[ FLMaterializer materializeFromFileNamed: 'pharo.form.fuel' ] benchFor: 10 seconds.
"a BenchmarkResult(16,443 iterations in 10 seconds 2 milliseconds. 1,644 per second)"
"0:00:00:00.000608283s per execution"
Sven
> On 5 Nov 2016, at 19:23, Sven Van Caekenberghe <
[hidden email]> wrote:
>
> Hi Matteo,
>
>> On 5 Nov 2016, at 16:11, Matteo via Pharo-users <
[hidden email]> wrote:
>>
>>
>> From: Matteo <
[hidden email]>
>> Subject: Speed up JPG images loading
>> Date: 5 November 2016 at 16:10:45 GMT+1
>> To: "Pharo is welcome (ML)" <
[hidden email]>
>>
>>
>> Dears,
>> I'm loading a lot of pictures (70) through the method
>> "ImageReadWriter>>formFromFileNamed:".
>> The method is very slow, with images bigger than 5MB.
>>
>> Is there a way to improve the pictures speed loading?
>>
>>
>> Thanks
>> Matteo
>
> I think we'll need more details.
>
> Here is what I tried:
>
> (ImageReadWriter formFromFileNamed: '/Users/sven/Desktop/audio359-main-1600.jpg') asMorph openInWindow.
>
> This is a 319K JPG 1600x2263 (Form's Bitmap length is 3620800).
>
> [ ImageReadWriter formFromFileNamed: '/Users/sven/Desktop/audio359-main-1600.jpg' ] bench.
>
> '2.788 per second'
>
> 2 to 3 per second is not very fast, but you create forms of 3.5M - In this case the PluginBasedJPEGReadWriter is used, which should be faster then any of the other formats.
>
> What you can do is store a FUEL version of the Form on file, that will be (much) faster (but much larger, it is basically a non-compressed version).
>
> Sven
>
Locked
