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we delay loading as much data as possible for as long as possible, so the most important work can get done first.
Our startup sequence works like this: First chrome.exe and chrome.dll are loaded. Then the preferences file is loaded (it may affect how things proceed). Then we immediately display the main window. The user now can interact with the UI and feels like Google Chrome has loaded, even though there has been remarkably little work done.
Chromium Blog: I/O in Google Chrome やっぱりいろいろ後に回して体感の起動を速くしてる。 (via ku)