Unlike standard feature updates, SP1 is a cumulative collection of all previously released security, performance, and stability patches.
Windows 7 is notorious for spending hours stuck on "Checking for updates..." after a fresh install. This is due to the sheer number of post-SP1 updates. By applying SP1 via the offline installer first, you dramatically reduce the update search time. In fact, many guides recommend the offline SP1 as the first step after installing Windows 7 to avoid indefinite update scanning. windows 7 service pack 1 offline installer 32 bit better
The Ultimate Lifesaver: Why the Windows 7 SP1 32-Bit Offline Installer is Still King Unlike standard feature updates, SP1 is a cumulative
