Perfect World Co.'s (PWRD) second-quarter profit jumped 61% as better-than-expected online revenue and cost controls led to a sharply improved bottom line.

For the current quarter, the Chinese online-game developer gave an upbeat forecast for revenue growth of 15% to 22% implying revenue of 756 million Chinese yuan to CNY803 million. Analysts polled by Thomson Reuters most recently expected a 15% increase.

Perfect World's earnings have slid over the past year amid decelerating ...