According to AN 11.2 below, it says that skillful virtue (sila) leads to freedom from remorse, which leads to joy, which leads to rapture, which leads to pleasure, which leads to concentration of mind.
It says that there is no need to will for this - it arises out of the very nature of being endowed with virtue and consummate with virtue. This to me is a statement of the efficiency of the use of virtue to lead one towards concentration. Furthermore, I think it is far more efficient to start with the cultivation of skillful virtue and skillful thinking, rather than struggling directly with the five hindrances in meditation.
"For a person endowed with virtue, consummate in virtue, there is no
need for an act of will, 'May freedom from remorse arise in me.' It is
in the nature of things that freedom from remorse arises in a person
endowed with virtue, consummate in virtue.
"For a person free from remorse, there is no need for an act of will,
'May joy arise in me.' It is in the nature of things that joy arises
in a person free from remorse.
"For a joyful person, there is no need for an act of will, 'May
rapture arise in me.' It is in the nature of things that rapture
arises in a joyful person.
"For a rapturous person, there is no need for an act of will, 'May my
body be serene.' It is in the nature of things that a rapturous person
grows serene in body.
"For a person serene in body, there is no need for an act of will,
'May I experience pleasure.' It is in the nature of things that a
person serene in body experiences pleasure.
"For a person experiencing pleasure, there is no need for an act of
will, 'May my mind grow concentrated.' It is in the nature of things
that the mind of a person experiencing pleasure grows concentrated.
"For a person whose mind is concentrated, there is no need for an act
of will, 'May I know & see things as they actually are.' It is in the
nature of things that a person whose mind is concentrated knows & sees
things as they actually are.
"For a person who knows & sees things as they actually are, there is
no need for an act of will, 'May I feel disenchantment.' It is in the
nature of things that a person who knows & sees things as they
actually are feels disenchantment.
"For a person who feels disenchantment, there is no need for an act of
will, 'May I grow dispassionate.' It is in the nature of things that a
person who feels disenchantment grows dispassionate.
"For a dispassionate person, there is no need for an act of will, 'May
I realize the knowledge & vision of release.' It is in the nature of
things that a dispassionate person realizes the knowledge & vision of
release.