My minecraft client side has been extremely laggy lately?

. Don't give me a bullshit answer like "install optifine" because trust me, ive tried it and edited my settings and everything. When I first got my laptop it could handle like 50 tnt going off at once! But know it falls from an average of 30fps to 10-14 when there are alot of players on the server. It's driving me insane!

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