Last (Minecraft) night I was outside to fight mobs. But I saw they react slower. I even could kill a skeleton in the water without getting a single arrow in my head.
Creepers in the morning waited about 3 seconds before they saw me!
And by the way, I don't like the new hurt animation. That red thing.
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Make sure the mac your hosting your server with has approximately 6 (or even more) GB (RAM), otherwise you could try to use two computers to make this work faster again (normally a computer shouldn't used for hosting and playing minecraft at the same time, though a computer with better RAM could be used for such purpose).

Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been delivered.
By the way, I got my own server: but I don't have slow internet! And I also play on the same Mac as I host the server!