Was heißt »leistungsfähig« auf Englisch?

Das Adjektiv »leistungsfähig« lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Deutsch/Englische Beispielübersetzungen

Dieses Auto ist leistungsfähiger als jenes.: This car has a better performance than that one.
Das Lernen ist das Elixir, welches das menschliche Gehirn zum leistungsfähigsten biologischen Entscheidungsfindungs- und Problemlösungswerkzeug des Planeten macht.: Learning is the elixir that makes the human brain the most powerful organic decision-making and problem-solving tool on the planet.
Mein Computer ist sehr leistungsfähig.: My computer is powerful.
Dadurch fühle ich mich stärker, leistungsfähiger und mutiger.: By doing this, I'm feeling stronger, more accomplished and braver.

Will the box fit in the van?
I did what I could; let those who are more capable do better.
"Does the variant that Tom suggested fit better here?" "I could imagine either one being used."
I'm fit to drop. I'm going to bed.
These trousers don't fit me.
His brother is quite a capable doctor.
None of my clothes fit any more.
Doesn't fit. Too short.
"That's a small clock!" "Well, it's got to fit in the hand luggage."
There must be a more efficient way to do this.
A short nap at lunchtime and, Bob's your uncle, I'm fit and raring to go.
She is not capable of loving any man.
I need twenty efficient workers.
The skip is full to overflowing. Nothing more will fit in.
Tom got rid of his regional accent because he thought it would be easier for him to fit in without it.
The hypothesis of some software capable of functioning as conscience can be completely ruled out.
Anyone who believes that conscious intelligence comes from the Big Bang is capable of believing anything.
What we owned in those days could fit into a shoebox.
From end to end, the DNA molecule measures a thousandth of a thousandth of a millimeter. A million helices placed side by side would fit in this letter: o.
Following her diet, Mary was able to fit into her old trousers again, which pleased her no end.