Its not really "slower" its just capped at a lower potential maximum speed. The average home user doesn't need nearly as much outbound bandwidth as they do inbound. For instance....I have DSL running at 5Mbit inbound and 1Mbit outbound. If I pay more, I can get them to raise that to 8.5Mbit inbound and about 2-2.5Mbit outbound.

Outbound speed is most important when uploading lots of data, or using a VPN for heavy file transfers/connections, or running web/game servers....I run a server over my DSL, and the 1Mbit...(100k or so) is generally plenty.

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