Recently somebody by the name of LeslieGilliams found out that water caused huge amounts of lag in the new 1.8 update.
Many people responded to the thread he made and a few posted their computer specs.
I compared all of them and found out that all the people who were having something in common:
Either they had a cpu that did not support AVX.
Or
They were using a 32bit OS (Which is unable to use AVX)
We think that Minecraft may be relying on Floating Point calculations Which are done much more efficiently with AVX and thus causing lag on systems that do not support it.
Please do research into this topic and try to fix it as soon as possible, as Minecraft is unplayable for a lot of people by this.
Link to the thread: http://www.minecraftforum.net/forums/minecraft-discussion/recent-updates-and-snapshots/2205517-i-think-i-found-the-source-of-the-extreme-lag-in?page=8
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kumasasa
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Really nice :/ Most advices on the reddit topic is: "outdated driver" or "update you driver" or "Your computer is below the recommended system requirements". But the fact is, since late 1.8 snapshots suddenly many people become having issues with the game. You can't tell people: "You have to buy a now computer because the game needs it now." And not everyone can update their OS to 64-bit to use 64-bit java.
So far many people could play even on older machines only with lower video settings. Now, on decent hardware they have problems to play comfortable. Lower settings don't always help. Yes, chunks load faster, but jittering and lags spoil everything. FPS are higher but often drops way too low.
kumasasa
Off-Topic. Most probably you're refering to MC-45458, so there is nothing new in your rant.
But I don't take your criticism, were trying to figure out what's in common with all those 1.8 lag stuff. To do that, we need to eliminate the most basic things like outdated drivers. As you can see in reddit that's helping sometimes.
Of course, there is MC-45458, but what you don't see is that many people maximizing the chunk render width on low end machines. The need for CPU, GPU and MEM counts is the render witdh squared !
lapppy
Probably related to [MC-68080] as well.
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kumasasa
Is this still an issue in the current Minecraft Snapshot 15w47c or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
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Ticket resolved as incomplete, because no answer in a reasonable amount of time (1+ year), if it still happens, please update the ticket.
All people with extreme examples of this problem (i.e. fps dropping to single digits) have been using 32 bit Java (see the thread in the description).
In all cases when these people changed to 64 bit Java they had a noticeable performance improvement - even with CPUs that don't support AVX (for example the above-mentioned LeslieGilliams).