I found a reference to a similar discussion from the past: https://pharo.fogbugz.com/f/cases/17403/Creating-Forms-from-PNGs-is-very-slo... Matteo, 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 <sven@stfx.eu> wrote:

Hi Matteo,

...

On 5 Nov 2016, at 16:11, Matteo via Pharo-users <pharo-users@lists.pharo.org> wrote:

From: Matteo <matteob8@yahoo.it> Subject: Speed up JPG images loading Date: 5 November 2016 at 16:10:45 GMT+1 To: "Pharo is welcome (ML)" <pharo-users@lists.pharo.org>

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