NILIf for some reason you need to reduce the download speed of emerge
when downloading sources you can use a tweak in portage's make.conf as
explained
[in the handbook](https://wiki.gentoo.org/wiki/Handbook:X86/Portage/Variables#Fetch_commands).
To keep wget and just add the bandwidth limit, add this to
FETCHCOMMAND="${FETCHCOMMAND} --limit-rate=200k"
Of course, adjust your rate to your need.