Latency Problem

i have a problem my ms is too high

min :
500 ( home
300 ( world

and some time it become
800 ( home
500 ( world

that happening with wow only my download good youtube videos good only wow not good
and this new thing i was playing more then 1 year i think and the ms was something like 50 or 80 but now i cant play lag all the time and ms more then 300

sry for my bad english

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