June 3, 2010 Patch (Portal)

{{Patch layout
 * game = portal
 * source      = http://store.steampowered.com/news/3900/
 * source-title = Portal, Half-Life 2, Half-Life 2: Episode One and Half-Life 2: Episode Two Updates Released
 * before      = May 27, 2010 Patch (Portal)
 * after       = June 15, 2010 Patch (Portal)
 * notes       =

Portal
}}
 * Added pre-caching of GLSL shaders on game launch to prevent hitching in game (Mac)
 * Performance improvements when using anti-aliasing on ATI GPU's