Not in my experience, I have a slim 360 which downloads at pretty much the same rate as my PS3 from PSN using a wired connection. Wireless downloads are far quicker on my 360 but that's because the 360 uses the faster wireless 'N' protocol and the PS3 is wireless G.
PSN isn't inherently slow.
#8992262, By bladdard Playstation Plus - Added subscription service
bladdard 672 posts
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