hello elvin,
1) first we'd like to know, if it says average 241.176, are you using open dns or proxy? and what is that proxy if in case its a proxy?
2) if it says, average smartbro, are you using the "obtain an ip address automatically" and "obtain dns server address automatically"?
its possible to have a 670 kbps connection but will never be consistent because smartbro is wireless which has intermittent (irregular) speed.