Replace prefetch logic (#251) is a 2% regression - #262
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A/B testing indicates this change caused a 2% score change in Safari. This seems surprising since this was intended to be a purely harness change. Reverting for now to confirm and to investigate the cause. This also reverts "Add resource loading bar (WebKit#246)" and "Improve Benchmark constructor and instance variables (WebKit#255)" as they blocked a clean revert. For posterity, this is tracked internally as rdar://problem/168103740
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Gonna merge this for now CC @camillobruni |
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humm ok, let's land these PRs separately then :) sorry for the noise. |
This was referenced Jan 19, 2026
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@kmiller68 Can you reproduce this regression locally, ideally even on JSC/shells? |
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A/B testing indicates this change caused a 2% score change in Safari. This seems surprising since this was intended to be a purely harness change. Reverting for now to confirm and to investigate the cause.
This also reverts "Add resource loading bar (#246)" and "Improve Benchmark constructor and instance variables (#255)" as they blocked a clean revert.
For posterity, this is tracked internally as rdar://problem/168103740