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GTM Server-Side vs Client-Side: Real Benchmarks and Honest Trade-Offs
Server-side GTM promises better performance, more accurate data, and longer cookie lifetimes. But the benchmarks tell a more complicated story than vendor blogs admit. This article compares client-side and server-side GTM across five dimensions — page speed, data accuracy, cookie durability, cost, and complexity — using real numbers from published tests and case studies.