The update, available directly from Apple, weighs in at 30.52MB for Snow Leopard Users, 38.59MB for Leopard, 26,78MB for Tiger, and 30.18 for Windows Vista, XP and 7.
The update addresses a number of issues related to the browser, WebKit, ColorSync, ImageIO and more. Apple noted the following changes for the browser in Safari 4.0.5:
Performance improvements for Top Sites
Stability improvements for 3rd-party plug-ins
Stability improvements for websites with online forms and Scalable Vector Graphics
Fixes an issue that prevented Safari from changing settings on some Linksys routers
The last update to Safari, version 4.0.4, came last November, when Apple addressed a vulnerability that could allow an image file to exploit Macs with older software.