#1
How do you play this?

--2--(2)--2
--3-- 3 -- 3
--2-- 2 -- 2
--0-- 0 -- (0)
--x-- x -- x
--x-- x -- x

Mose specifially the notes in the parenthesis. I know that its a D chord, but I'm completely clueless as to the parenthesis
xbox live gamertag: phillips215
#2
The parenthesis mean to keep the note held longer, basically it's saying those notes stand out more.
#3
it actually depends of the tabber. Some say parenthesis mean to hold out a note longer, some say parenthesis mean that that note is quiet
#5
In some cases it means continue holding the note from the last time it's played.
So in that scenario you'd want to keep the 2nd fret of the high E (Gb) ringing and then when you play the next D chord, don't strum the Gb but allow it to continue playing from the previous chord.

It can also mean play the note quieter.

Or it can symbolise a grace note, which is essentially a very quick note that comes in before another note. In this case it does not symbolise a grace note. A grace note would look more like: --(8)9-- on your tab.

So yeah... Depends on the tabber
Speed is a by-product of shut the fuck up.