It's not just the transfer... It's the compile, load and perceived speed. 1mb compressed and gzipped can be a hundred MB parsed and in memory. Which isn't bad on a modern mid level desktop, but it's crazy on a lower end smart phone.
There are also other factors to consider. I'm not huge in premature optimization, but damn.
There are also other factors to consider. I'm not huge in premature optimization, but damn.