Yahoo said on Tuesday that its business continued to deteriorate in the first quarter, putting more pressure on the company to find a buyer quickly for its Internet operations.

Marissa Mayer, Yahoo’s chief executive, said during a webcast to discuss the financial results that a review of potential suitors was proceeding at the “fastest responsible pace,” but she declined to be more specific.

She also disputed news reports that the company was dragging its feet on a potential sale and refusing to share information with bidders.

“Let me be unequivocal: Our board, our management team and I have made the strategic alternative process a top priority,” Ms. Mayer said. “We’ve been responsive and engaging, having personally answered hundreds of questions and requests for information.”