I found a reference to a similar discussion from the past: https://pharo.fogbugz.com/f/cases/17403/Creating-Forms-from-PNGs-is-very-slow
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 <s...@stfx.eu> wrote: > > Hi Matteo, > >> On 5 Nov 2016, at 16:11, Matteo via Pharo-users >> <pharo-users@lists.pharo.org> wrote: >> >> >> From: Matteo <matte...@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 >
