Korhonen shot 67 for a nine-under 135 halfway total, and a one-shot advantage over Englishman Steve Webster and South African Justin Walters.
The European Tour tournament is the first held on a major tour in which players are being timed on every shot in an effort to speed up play.
Competitors are allowed 40 seconds -- or 50 seconds for the first player in a group to hit -- with a one-stroke penalty for a bad time.
Through two rounds, nobody had been penalised and the experiment appeared to be a resounding success.
(Reporting by Andrew Both; Editing by Toby Davis)
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