Try closing other programs to free up RAM. RAM is the main influence of how minecraft runs. It is recommended that you have at least 3GB of RAM on a 64-bit computer.
You can also try turning the render distance down by press ESC and then going to options > video settings and then clicking on render distance until it gets to short or tiny, which ever works for you best.
You could also put your minecraft worlds onto a Partition on the RAM to make them load quicker using a program called RAMDisk then create a symbolic link between the two folders (.minecraft saves and the RAM partition) using some command prompt.
Running a server then playing off the server makes minecraft work a little better. Just open the server file and then in the minecraft ip box for multiplayer type in your computer's name (EG Chris-PC or John-PC) where 'Chris' and 'John' is you would put your computers username
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Yes, but it might lag.
No air probably has outdated hardware to run it with a huge lag
There's technically no limit, but after a certain number your computer would surely lag too much to play or freeze altogether.
use a 64-bit java to run minecraft. Or install optifine to reduce lag
Roblox does not have a virus, and blockland is a download, minecraft is java-based, and atmosphir needs a plug-in. The best answer is still minecraft, because java is pre-installed on most computers. The latest version of minecraft is pay to play, and the browser version has lots of lag.