[ubuntu] Opening large files in shotwell makes desktop to freeze !

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http://ubuntuforums.org – This my first post. I am using ubuntu 11.10 64 bit on asus k53sv netbook. Whenever I double click some large sized (>16 mb and some upto 450 mb) jpeg and png files, it makes my desktop to freeze completely. I have tried to produce the bug (if can call it so) several times and here is what I noted just before it goes to freeze: 1. The physical memory usage suddenly increases from 500 mb to 5.2 GB just after opening in shotwell photo manager. (I have 8 GB RAM in my machine.) 2. CPU usage shown in 'System Monitor' is about 100% in two of the eight CPUs shown there. (Its an Intel core i7 (Hardware)