My problem is: my netgear wifi modem has suddenlly(a few months ago) gone super slow but it is wired to my computer which has fast internet (speeds are 1.5-2.1mbps) which is fast in australia condiering our 3rd world country lines. While our wireless devices get 18-47kbps which is unbearable. I have tried to change the channel(or whatever its callled) to differnet channels but still no luck and remove interference which also didn't work. The router used to give out same speeds as the computer but suddenly it stopped.

Best thing to so is to call your provider. That has been happening with our BOB wifi was well.