The same way XDA Developers strived to optimize the graphics performance for many HTC models like Diamond, Touch Pro and HD, after the release of the HD2, (almost) the same guys figured out a way to improve the graphics performance of the Leo.
Quoting the authors, “for many Leo users several OpenGL games and apps do not work properly, are very slow, or stutter. This patch aims to fix these issues somewhat”. Also, “the current release is not the fastest revision of the patches tried. It does however seem to work best across the board of the games and apps tested”.
Install this patch only if you have an HTC HD2 but please note that a backup should be handy just in case. Soft reset to activate.
(Source: XDA Developers)