<b>Client-side vs server-side Prebid: the cookie tax</b>

<b>Client-side vs server-side Prebid: the cookie tax</b>
<i>Heard:</i> everyone moving s2s 'for speed' is quietly eating a 20-40% match-rate haircut from server-to-server cookie syncs.
— Client-side: best match rates, full SPO control, but 8-12 bidders maxes out browser CPU and tanks CLS on mobile.
— Server-side: scales to 30+ demand partners, lighter page, but you trust the s2s vendor's auction and lose per-bidder timeout granularity.
— Hybrid: top 4 revenue bidders client-side, long-tail s2s. That's where the real operators live.
<b>Impact:</b> Don't go full s2s on a cookie-dependent stack without measuring match-rate first. (sourced)

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