Really, really, really bad lag

[Chelsea Laser]

Hi folks! I have a MinecraftEDU after school program and there are about 15 people in the club (give or take) and we have been experiencing horrible horrible lag! Does anyone else experience this or have an idea on what causes it and how to ameliorate the situation? We had a beautiful server with a village that the students built up with a working farm and store houses and a fountain in the square and we had to abandon it because students couldn't break the blocks or got stuck in the world upon logging in. We are using the most recent stable update. Last year we had just a few less people and we never had the lag issues. Please help. I have people dropping out because it's so frustrating to play!

[Matt Coia]

My first question would be: Is this lag only associated with this world or does it happen in any world you use?  

The lag you are experiencing could be from what has been created in the world, such as if there are lots of animals, or signs or item frames or moving water or moving lava or redstone contraptions. The distance between all the players can be a factor also but if they all stay in the same village, that shouldn't be a problem. 

But it also is likely to be computer/network related. If you are using wifi to connect, that can be a slow spot. Also, if your computers are 32bit operating systems, you are relegated to lower memory allocations.  A 64bit system on at least the server machine would be a big help. 

Let us know as much about your network and computer setup as you can and if you've tested with other maps, etc. Then we'll help the best we can. 

On Thursday, November 19, 2015, Chelsea Laser <cla...@garaway.org> wrote:

Hi folks! I have a MinecraftEDU after school program and there are about 15 people in the club (give or take) and we have been experiencing horrible horrible lag! Does anyone else experience this or have an idea on what causes it and how to ameliorate the situation? We had a beautiful server with a village that the students built up with a working farm and store houses and a fountain in the square and we had to abandon it because students couldn't break the blocks or got stuck in the world upon logging in. We are using the most recent stable update. Last year we had just a few less people and we never had the lag issues. Please help. I have people dropping out because it's so frustrating to play!

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[Chelsea Laser]

We've had the same issue on 3 different worlds, the computers (except mine which is hooked up by wifi) are hooked up by ethernet and they have 64 bit operating systems. We started with a fresh new world with only a spawn block and with monsters, villagers, Tnt and dimensions disabled and it was the same issue. It dropped dramatically when several students left. We had 12 kids last year and never had these issues. 

[EduElfie]

Are the students running in all different directions on a newly made world, that will cripple even the most robust server machine. Terrain generation is a killer for the server. Also do you have any mods installed, some mods and the content they add can definitely impact on the lag within a server.

Elfie.

[Chelsea Laser]

We are only using the MinecraftEDU mod but yes, students are trying to find their bases. Will it balance out? I had students doing the same things last year and we did not have any issues. I cannot help but wonder if it's the version we're using. I may go back to an older update and see if that works, one without all the turtles and programming stuff.

[Erin Gaudet]

I would suggest turning down the Render Distance (once they launch, they click "Options" then "Video Options") We have it turned down to 3 or 4 (default is 10) and haven't been having a problem with lag since we made that change. 

[Chelsea Laser]

Thanks Erin, I will try that. For now I have my students split into two groups; one on the server building, mining etc. and the other group building in single player creative for an end of the year builders showcase. They switch off each week. I hope that your suggestion will cure the need to split. Thanks!