FPS is VERY unreliable in singleplayer

I always have those settings cubethethird. I switched to max fps when it got worse but it still continued. occasionally it will run ok for up to 15 minutes but once every couple of seconds the FPS will drop for a second until it is dropping for up to a minute straight.

It began for me during the snapshot 36a. at first it worked smoothly with no glitches or lag. I could have over 300 mobs in one place with no lag. slowly the fps dropping began. every day it got worse until it became like this. There was another problem I noticed. If you spend a lot of time in a world without using a different minecraft frame the memory being used continuously increases until it runs out. You can't just save and quit, you need to delete the frame and make a new one to reduce the memory being used to normal

Mods, think before you ignore this.

I'm SO SORRY for not being online my mail box website crashed and...it's a long story.
So here are the answers of your questions:

Q:Does this still occur if you reduce the video settings, like turning off smooth-lighting, or making the graphics fast instead of fancy?
A: Whatever I do I get the lag,I'm running on Normal distance to see the sun, but even on Tiny there's a lot of lag

Q:Does Not Happen To Me, Happens Around Every Minute? Every Three Minutes The World "Auto-Saves" So Your Troubles Might Be Closely Related To World Saving.
A: Sometimes it happens every minute, sometimes every 30 minutes,it's always random,but I think they must place a button that disables that AutoSave,or make it save when hitting the Escape button or something... (just an idea)

David Morris wasn't asking questions, but at last I'm now sure I'm not alone 🙂

-I always have those settings cubethethird. I switched to max fps when it got worse but it still continued. occasionally it will run ok for up to 15 minutes but once every couple of seconds the FPS will drop for a second until it is dropping for up to a minute straight.
A:Whatever I change it to,it's still random (sometimes I need to change to power saver and the lag isn't that much, but it's still there, ANNOYING !

-Mods, think before you ignore this.
A: +1

I hope they fix this because i feel so sad about Minecraft when I think about the lag...this is the only game i had bought (Im'a pirate, arrr!)

Are you sure that power-saver makes it better? Because if that is the case, the problem may be with your graphics card.

It's the same, like it doesn't change anything

Is this still a concern in the current Minecraft snapshot? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

I can't really say, I can't change my minecraft version to snapshot...I will tell what are the changes when I can

It still happens for me with last snapshot but the lag spikes seems to be shorter...
The problem happens a lot more when using HD texturepacks (128x for example). Have a look to my report for more details: MC-8598

Just tested it, same result as Sphax's one, but probably because my computer is only 1 GB RAM?
I don't really think that's the problem but let's say it is >.>

A computer with 1 GB of ram will have FPS issues.

If you have only 1GB of ram, you are almost 100% guaranteed to have performance issues, especially if you are using a Windows operating system. A fair chunk of the ram will be consumed by the OS alone, leaving only so much for other applications. Plus, when the ram gets full, it puts some of the contents onto the hard drive, which is many times slower. To increase performance, I would recommend either adding more ram, getting a new computer, or trying minecraft on a less resource intensive operating system, such as a linux distribution (eg Ubuntu).

My computer have 4GB RAM and I have lag spikes. It seems a bit better with last snapshot but they are still there and happens every ~30 seconds and takes ~10 seconds... However, the lag spikes in Minecraft 1.4 were "smaller"...

Thanks for the answers, the problem is there that I don't have money to buy RAM and other stuff, and I can't switch to other operating system because I make software under Windows.
Thanks anyway... 🙂

I'm not saying that all problems in regards to lag are due to hardware and operating system, but rather that these can be a factor in performance issues. It is clear (with the amount of attention this report is getting) that there are performance issues directly related to minecraft.

Okay, I don't think that the problem is all in my computer, I found some options like NVIDIA Control Panel and nView Desktop management stuff and something like options were like this
nView Desktop Management: Enabled with some mouse commands like in touch screen and transparent windows...it was all enables, so I disabled it all,on NVIDIA Control Panel there was some scale that starts from High Quality-Quality-Sable-Performance-High performance
It was set on High Quality so I moved it to High Performance...nothing's changed 😞
I found a option in My Computer>Properties>Advanced>Performance [Settings]
And I have unchecked everything, my computer looks shitty, but much faster...well not for Minecrtaft, it's stilkl the same story, and that's why I think the problem is not in my computer, but in Minecraft
PS: My antivirus AVG 2013 is the only program that is running when I start playing Minecraft.

DyO Kasparov, if you are using an NVIDIA card, have you set it to accelerate Minecraft? It will not do so by default. Update to Java 7, and in the NVIDIA control panel, add java.exe and javaw.exe and set them to "always accelerate" (or whatever it says there). I also added minecraft.exe to be safe, not sure if it's necessary or not. I went from 10-20 fps to over 100 doing this. Sources: http://www.minecraftforum.net/topic/1237727-fix-minecraft-lag-and-more-nvidia/

Ben Johnson I'm not that much of a PRO on GPUs and I can't find Accleration setting because I don't know what the actual name is, try telling me keyword and I might find it 😃

Go to the NVIDIA Control Panel, then to "Manage 3D Settings". Then go to "Program Settings". You add the files I mentioned above, and choose the option to use the dedicated graphics card rather than the integrated graphics. It might say something like "high performance graphics" or "NVIDIA card" or something. Sorry, I'm not near my personal computer ATM so I cannot verify what the setting says exactly.

Of course, this is only on a computer with an integrated graphics card and a dedicated graphics card, where the CPU has to determine which card to use for which application.

I'm not a pro, either. 😉 There are a bunch of threads on Minecraft forum, and some information in the wiki, too, though. You can allocate more RAM to minecraft, too, but I haven't tried that, just the NVIDIA tweaks and that worked for me, but YMMV, of course. Good luck!

Okay I see that there is description whenever I click option from the list, I've set everything on High performance and everything else that contains Incrase Performance on it 😃
By the way I've found an option Maximum per-rendered frames, Can you tell me what's that used for because I can't really understand it, English is not my primary language 🙂

As always, an alternative option for better performance is to use Optifine. Though it is a mod, it has for many (including myself) improved performance and stability. This is of course only a temporary solution, however a planned feature of the Redstone Update is to rewrite and improve minecraft's rendering engine, which should lead to more stable performance in vanilla.

I have a Nvidia graphic card but nothing on the tweaks mentionned above have resolved the problem... The snapshot 13w04a is better in performance than the previous version but I still gets Lag spikes.

The snapshot runs much smoother and the computer's memory is less than 50 % free...not until I gte the lga,after tat it gest 3 % free memory, mnecraft gets on 1-7 FPS (getting 10-17 FPS with no lag) and I need to wait 1:34 minutes (i timed it) on pause menu if i want the lag to be gone for 3:41 (timed that to )
CPU gets 100 % while the lag is on, normally I get 60/70 %
Overal, Jeb made it so that it wont use to much ram but not the lags 😞

MY FRAPS ON LAST UPDATES is 130 fraps on default world......now 1.4.7 ONLY 20 to 40 fraps T_T
I have 4 gb ram

Dear Mods, could you please have a look at MC-8824, which was marked as a duplicate of this issue. I believe this is a new bug, and it should be reopened.

this started happening to me in the latest snapshot 13w05a
very strange

MC-8824 seems to just be this snapshot, while this issue has occurred for A while according to the community.

I think the lag I was getting in snapshot 13w05a was because of it's bug?

Im still getting FPS drops in the new snapshot 13w05b I used to get 120 FPS easily with max settings in the earlier snapshots like in 13w01a now I am getting like 40-60 fps. I only started to see this drop in 13w05a and up.

This has been happening to me in SSP and SMP. Before 13w05a and 13w05b, I could run smooth lighting, but now it causes me a lot of jitery lag.
It reminds me of when they tried to fix lighting last time 😞.

I too have this problem. Before pre-release 1.5 I had beautiful framerate, but now it lags like all hell broke loose. I think tested on Minimal lighting, same thing. Then I tried with NONE, and it completely fixed the problem. Thus being said, this is definitely a lighting engine problem. Please fix it!

lol me and everyone else who I know stopped playing Minecraft because of the lag that came from 1.3 and newer...Goodbye ! 😛

until mojang fix this you could download optifine mod, this will allow you to change your auto save time to every 30 mins meaning you could play for 30 mins before massive lag spike perhaps more berable

Lately I've been playing with the Feed the Beast modpack, and finding a gradual buildup of poor FPS and randomly spiking fps.

I got fairly desperate with it, as the random nature of the fps falloff (F3 reporting single digit FPS around the 1-4 fps mark, with occasional 0 fps and sometimes upto 9 FPS) made the game unplayable due to its inconsistent responses to input.

I decided to try the current version of Optifine for minecraft 1.4.7. Having installed that and used, granted, minimal settings, the Optifine rendering engine delivers a stable, steady and thus playable FPS of about 15, using the same world that was unplayable under the default "randomly spiky" rendering engine.

While this doesn't necessarily point the finger firmly anywhere special, its does confirm that for the same (singleplayer) world and same computer hardware running it, there are some issues with the default rendering engine.

I know that isn't tons of help, after all, but it is a strong hint 😉