WTH is "Low Specs Mode" For?

WTH is "Low Specs Mode" for? It is suppose to work better but i don't feel any difference. I read that when you activate it adjust according to your specs. This is not a definition "Low Specs Mode". "Low Specs Mode" be like, I'm in great trouble with normal client and when I activate boom, It should safe me {{summoner:4}} {{summoner:7}} {{summoner:1}} and I say wow that perfect. And on the other hand there is no use if it still feels slow {{summoner:3}} like before. "Attention on this Feature PLZ" Thank You
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