is 70ms too much for competitive play?

I have been learning the game and watching videos. Some players I watched have under 30MS, while mine is randomly going between 70-90ms. (DSL is my only option where I live). It also appears their champion reacts much quicker to clicks, but I want to get some opinions to see if this is true? Is there a big difference between 30ms vs 70ms? WIll it be worth doing ranked on my internet? Thanks for your time.
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