Get the latest version of Apple Safari for Windows, version 4.0.3, available now for download on FileForum.Safari 4.0.3 Update: Mixed Performance Results Raise Questions

Apple's recent security update for Safari 4 on Windows platforms has delivered a complex performance profile that both impresses and puzzles browser performance analysts.

The latest build (531.9.1) demonstrates notable improvements in page rendering speed, a crucial area where Safari has been fighting to maintain its once-dominant position against Google's increasingly competitive Chrome 3 browser.

On Windows 7 RTM, the browser showed approximately 5% overall performance enhancement, with its benchmark score increasing from 12.58 to 13.09. However, Windows XP SP3 users might notice a slight regression, as Safari's performance index actually decreased marginally from 16.16 to 16.01.

The most concerning discovery involves AJAX functionality - specifically the creation of XMLHttpRequest objects. This fundamental component of modern web applications showed alarming performance degradation in the latest version. What previously took Safari just 23 milliseconds now requires a sluggish 371 milliseconds to complete - making it even slower than Internet Explorer 7, which serves as the baseline in benchmark comparisons.

This unexpected AJAX performance issue has effectively prevented Safari from decisively outperforming Google Chrome in overall benchmarks, despite gains in other areas. Some testing experts have questioned the significance of this particular test, as it only measures object creation time without evaluating actual implementation functionality.

The dramatic performance swing in this specific area raises questions about potential code regression or architectural changes in how Safari handles these critical web application components.Despite Apple's security update not mentioning XMLHttpRequest,

a known vulnerability involving header manipulation was previously acknowledged.

WebKit, Safari's engine, could be tricked into accepting unauthorized requests

by inserting carriage return/line feed sequences into headers.

The sudden AJAX performance drop in Safari 4.0.3 hints at a temporary security patch,

possibly leading to another quick update.

Meanwhile, Opera 10 Beta 3 shows inconsistent speed results,

performing worse on Windows 7 than on Vista.

Mozilla's Firefox 3.6 alpha, codenamed "Minefield,"

achieves a benchmark score over 10, doubling Opera's performance.

Opera's latest beta remains available for download,

even as its speed claims fade against competitors.

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