Why is my Hp TouchSmart 15-r015dx is work slowly

My pc is Window 8.1,64-bit,

System Model:Hp 15 Ts Notebook Pc

Processor;Intel(R)Core(TM)i3-5010U CPU @2.10GHz

Memory;6144MB RAM

2010MB used

5713MB Avaliable

Why is my computer is workslowly?

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