Maybe the reason for the lag is ... Water. After testing some things, some guy found out that the game becomes laggy when near water sources, and a waterless world should not lag. You guys should test it out:
MC-71078
About the lighting test: I think it didn't bring very significant results. I did the following:
Created a completely dark room in the overworld, and in The Nether.
Below it, I put a clock redstone circuit to light on/off 7 redstone lamps.
Tested what would be the FPS with the circuit running with all light coming from it blocked by solid blocks, and with the light not blocked.
In the overworld, with the lights blocked, I got around 180~200 FPS with the lights blocked, and 150~170 FPS with the lights not blocked.
In The Nether, in both cases I get constant 200 FPS.
Yes, yes, and yes. That explains everything. I had my base on a very little island surrounded by an ocean, and the FPS dropped everytime I sprinted. Doing some tests,
I noticed that, while flying-sprinting in a world without water, I get an average of 115 FPS. Meanwhile, in a customized world so the only biome is river, the FPS drops to ~65, my fan turns on and I get some stuttering. Will test later about the lighting, but awesome find if you're the author! =)
Why does this work like this? .-.
Nice, didn't know that. Thanks!
There's not too much of it .-. that's completely fine.
Fixed on 14w32d.
Still happens in 14w32b.
Oh, that's true. Derp.
Yes, that's weird =L
It's kind of strange that nobody (as far I searched) noticed that before.
Mmm, I see. Thanks for the info!
Maybe something changed in Options>controls?
@Michael Vertex Buffer Objects, a new way to manage a map's elements being tested in Minecraft, to increase performance. You can toggle it on Options > Video Settings > Use VBOs
Well, yep! Should be ... Ticking entity ... Well, I hope it gets fixed, because that minigame is going to be evil.
Done.
Fine. I'll record.
Still happens in 14w31a.
Nope. I can confirm that the game only lags when the player is near water.
Take a look: https://bugs.mojang.com/browse/MC-71078