Will the new macbook 2015 become slow quickly?

  danb1 21:45 06 Apr 2015

I don't know much about the macbook processor: 1.1GHz dual-core Intel Core M processor (Turbo Boost up to 2.4GHz) with 4MB shared L3 cache

But I was wondering - Laptops tend to slow down and many people are saying the processor is good enough. But I was wondering - after a year or two, will the laptop get pretty slow?

I am currently choosing between the macbook and retina macbook pro and would like it to last 3-4 years.

I will probably use it mostly for web surfing (maybe like 20 tabs up...), watching HD videos and microsoft office (some pretty heavy excel work). Nothing too heavy like gaming, but I want it to consistently be perky.

Thanks for your help and advice!!

PS: just for reference I currently have an ASUS with Windows 8 i5 6gb ram (1.8 GHz). It is fairly cheap.

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