Beckford, who arrived at Goodison Park from Leeds at the end of last term, has only notched one goal for the Toffees so far this season, but Cahill is confident he will prove his worth at the club.
"There's no shadow of a doubt about Beckford's ability," said the Australian international.
"He's scored the goals and you can see in training what he can produce and what a great player he is.
"It's only a matter of time. You need consistent game time and that's all it is.
"He's got everything and I think we're very lucky to have a player of his calibre because his speed and his finishing is pretty impressive."