May 27, 2010 Patch (Portal)

{{Patch layout
 * game = portal
 * source      = http://store.steampowered.com/news/3877/
 * source-title = Portal, Half-Life 2, Half-Life 2: Episode One and Half-Life 2: Episode Two Updates Released
 * source2     = http://store.steampowered.com/news/3879/
 * source2-title = Portal, Half-Life 2, Half-Life 2: Episode One and Half-Life 2: Episode Two Updates Released
 * before      = May 25, 2010 Patch (Portal)
 * after       = June 3, 2010 Patch (Portal)
 * notes       =

Engine

 * Fixed fonts sometimes not displaying when the game is loaded (Mac)
 * Fixed crash on launch in rendering subsystem (Mac)
 * Fixed crash on launch (Mac)
 * Fixed main menu not rendering on 10.5.8 when anti-aliasing is enabled (Mac)

Portal
}}
 * Optimized particle rendering for lowend GPU's, made acid pits more performant (Mac)