“Apple seeded developers last month with Mac OS X 10.5 Leopard build 9A343, which remains the most recent and offered a number of improvements over its predecessor, build 9A321,” Think Secret reports.

Think Secret reports, “Thanks to Leopard’s many under-the-hood improvements, users can expect to see signficant gains in performance and responsiveness under Mac OS X 10.5, especially on recent Macs. Window resizing relative to different System Preference Panes, for example, is now instantaneous and completely smooth, without that half-second delay found in previous Mac OS X releases.”

“Sources continue to peg Leopard’s release around the end of March, a date other publications and analysts have also suggested,” Think Secret reports.

Full article and link to screenshot gallery here.