Upon investigating this a bit further, it seems the issue has to do with the sort column and in particular the "package in main"/supported/logo column. When sorting with this column, synaptic behaves excruciatingly slow. Use any other column to sort and it's back to normal.
Eric M. Smith: Please try this and see if it helps, thanks. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/658924 Title: Synaptic hangs several minutes (de)selecting or listing packages -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs