One tag manager = 540ms main-thread, 0 visible content
Third-party scripts execute on your main thread and block interaction even when they paint nothing.
— Tag manager loaded 14 child scripts, total 540ms of execution scattered across the first 5s
— TBT (total blocking time) attributable to third parties: 380ms of the 540ms total
— Moved the manager to a web worker via Partytown: main-thread cost dropped to 60ms
— INP improved 240ms -> 160ms because input wasn't fighting analytics for the thread
Takeaway: -480ms third-party main-thread time, INP -80ms at p75.
Millisecond Mafia
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One tag manager = 540ms main-thread, 0 visible content
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