The 37-year-old spent 45 minutes on the dusty Aorangi Park practise courts on Wednesday, hitting back serves delivered at high velocity by a male hitting partner.
Williams sent many returns whistling back to the baseline, occasionally getting a thumbs up from her coaching team, while others sailed way beyond the margins of the court.
Konta tops the ace leaderboard in the women's singles with 28, one more than Williams who is the oldest woman to reach the Wimbledon semi-finals for 23 years.
Against Simona Halep on Tuesday, Konta offered up only two break points in a match lasting two hours and 38 minutes.
"Johanna's serve is a massive weapon," her coach Wim Fissette told Reuters this week. "Most woman players would like a first serve as good as Jo's."
Following her quarter-final victory over Jelena Ostapenko, Williams told a news conference that she would be expecting a close battle with her British opponent.
"I think we play a very similar style," she said. "Aggressive, serve well, return well, very solid off the ground. So really it's just about playing that game better and see where you find openings on that day."
Williams is bidding to win her sixth Wimbledon singles title and eighth grand slam -- nine years after last lifting the aptly-named Venus Rosewater Dish on Centre Court.
Konta, who will be playing in her first Wimbledon semi-final, is attempting to become the first British winner of the women's singles since Virginia Wade in 1977.
(This story corrects date of Wade win in final paragraph)
(Reporting by Martyn Herman; Editing by Christian Radnedge)
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