lag can't be completely avoided, but you can reduce it by going to your options, and lowering quality features, such as changing fancy graphics to normal graphics
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Yes, but it might lag.
use a 64-bit java to run minecraft. Or install optifine to reduce lag
Lag, viruses and not the proper game. And if you love the game so much why not support mojang (creators of minecraft) and buy it?
No air probably has outdated hardware to run it with a huge lag
It shows the game's framerate, coordinates (I think), and some other info. Also, it has a little bar that shows lag in servers. The higher the spike goes, the more lag there is.