internet speed problem

AMDRadeonHD

Honorable
Jan 10, 2013
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why are my youtube videos buffering even at 360p halfscreen and i have a 4mbps download and 0.5 upload speed, here is my speed test result: http://www.speedtest.net/result/2675327645.png
is it because it's running on a relly old laptop from 2003? it's specs are intel pentium m 1.4GHz, mobility radeon 9200, 512mb ram (i'm using this laptop because my computer died about 6 months ago and i don't have any money.
 

AMDRadeonHD

Honorable
Jan 10, 2013
1,087
0
11,660
is it because my sister uses internet on a tablet wirelessly? does that interfere my internet speed? it's working fine now at 360p. when it loads the video now, it buffers like this :::::::::::::::::::::.................... but before that it was always ::::::::::::::::