Adverb is the word which describes a verb.
Eg., She danced gracefully.
Here, Gracefully is the adverb as it describes the verb Dance.
A simple method of increasing your writing speed is:
1st select a paragraph and set timer in your watch. Try to complete the whole paragraph, but if you do not finish , do not be disheartened.
As you practise, reduce the time gradually but maintain your handwriting.
You can even ask somebody to dictate a paragraph in a moderate speed and try to cope up with it.
Wish you Luck..
Hope my suggestion helps.