safari 4 sets (get back your safari 3 gui)
Disable new Toolbar Features (e.g. tabs on top)
defaults write com.apple.Safari DebugSafari4IncludeToolbarRedesign -bool NO
Disable iPhone-Style Progress-Bar
defaults write com.apple.Safari DebugSafari4LoadProgressStyle -bool NO
via: fscklog.com
Apple Safari takes more resources compared to Opera and Firefox. sometimes it also freezes so i would still stick to Opera.
i like the design of Safari 4 but i think it uses more resources compared to Opera.
i really love the layout of Safari 4. the graphics of this browser looks much better than firefox.