How do I revert back to the old client?

How do I revert back to the old client ? The new client for me is too laggy, It lagged so much it prevented me from banning champions or picking champions cant even change my masteries or sum spells.. It could be my PC maybe my PC cant handle all the animations either way I cant play.
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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