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hey i have the TD-W8960N v7 .. when my sisters laptop is connected to the internet then all the internet is kind of laggy .. and the mpbs is 2 or 1 .. so i think the best option for me is to control the bandwith and set it low . i am playing games so i need a little bit more from her , generally on speedtest i see 8 mpbs .. i cant find the option on the modem page i search on the manual too, please help me.

EDIT: my pc is connected with the modem trough a ethernet, the modem is almost 1 meter from the modem !