Some questions for you, so we can ascertain the root of your problem:
What do you mean by 'Computer on go slow'? Does your computer take ages to boot up, does it take ages to open or close programs or does it take ages to load pages in your browser?
Please answer with as much detail as possible.
And, your 54MBPS is the rate at which information travels between your wireless router and your laptop, not the download speed of your ISP.
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