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hobbit_longonon The feature supported in IE6, but not Chrome

Who said anything about encryption?

hobbit_longonon The feature supported in IE6, but not Chrome

The OP is demonstrably an idiot. He calls himself "Developer, CEO of The Student Cloud", and yet he apparently has no clue whatsoever about the most basic compression algorithms. Zipping compressed images is something that my mother does.

hobbit_longonon The feature supported in IE6, but not Chrome

I'm not misunderstanding anything. Your very last point contains:

"We still don’t quite understand why nobody sends gzip’ed images"

hobbit_longonon The feature supported in IE6, but not Chrome

gzipping web content isn't optimisation 101, that's optimisation 102.

Optimisation 101 is profiling.

hobbit_longonon The feature supported in IE6, but not Chrome

Is this a joke?

You want to know why people don't gzip their images? What benefit do you think you get from gziping a jpeg or png stream? Why were you trying it in the first place?