Try turning down advanced graphics and if that does not work than you need to use a computer that handles minecraft more smoothly like a PC. Mac is okay. A Netbook always lags and is almost impossible to play on.
Turn most of the video settings down. Ie render distance to small or tiny.
By getting a new and better pc (or mac), getting software to improve performance, or adding things such as more RAM to your pc.
Yes.
Currently HD texture packs are not supported my Minecraft, and therefore are bound to lag. Having a powerful computer may prevent lag from occurring due to an HD pack, but not always. To fix lag due to HD packs try making sure the only program you are running on your computer is Minecraft as HD textures tend to make Minecraft require a lot more RAM.
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
Your computer is old.
there is no viruses on minecraft just lag and pixelmon has none to
You cannot make a hang glider in Minecraft without mods.
That depends on your computer.
Yes, but it might lag.
There is none. Lag is produced from your own computer, not recording systems.
If it where possible i would say yes, it could be if you have a super fast computer.
There is no brass in MineCraft without mods.
use a 64-bit java to run minecraft. Or install optifine to reduce lag