I just realized that it's one minute and nine seconds runtime for you. That's way more than what it should be. Reading an 1920x1004 non-interlaced RGBA png image takes less than 200 milliseconds for me using Cog.
Can you share the png image, so we can test it?
Levente
After you said that it's not normal behaviour I tried to reproduce it today. 1. I cannot reproduce those 1 minute delays. 2. I've downloaded fresh Cog (http://www.mirandabanda.org/files/Cog/VM/VM.r2776/coglinux-13.33.2776.tgz) and Squeak (http://ftp.squeak.org/4.4/Squeak-4.4-All-in-One.zip) 3. I've got the following delays in one of my images with the fresh Cog: 0:00:00:41.598 0:00:00:26.942 0:00:00:36.862 0:00:00:32.338 0:00:00:38.316 3. I've got the following delays in the fresh Cog and the fresh Squeak image: 0:00:00:09.108 0:00:00:14.544 0:00:00:12.226 0:00:00:14.174 0:00:00:13.816 4. Still it's around 15 seconds. Image dependence is interesting because they seem to be the same versions (latest update: #12327).
uname -a Linux mglap 2.6.27.21-3.2-pae #1 SMP Wed May 20 03:21:35 CEST 2009 i686 i686 i386 GNU/Linux
cat /proc/cpuinfo ... model name : Genuine Intel(R) CPU T1600 @ 1.66GHz ... cpu MHz : 1662.478 ... cache size : 1024 KB ... bogomips : 3324.95 ...
And here are some photos:
https://dl.dropboxusercontent.com/u/37119147/all.zip
And here is the application I use to read them in: a) Create an empty directory b) Unpack all.zip to it c) Filein Anotator.st d) Run it: Anotator new start. e) Open transcript e) Choose the directory with photos f) Klik lewo (left) and prawo (right) to move from one image to another (it will create some .txt files while doing it, so it may ask you if you want to overwrite) g) see the numbers in Transcript
If you don't want to run the whole app, just run: [PNGReadWriter formFromFileNamed: '/some/path'] durationToRun
Mateusz