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Queries are 2x faster, but we're making some event properties temporary

PostHog· by Phil Haack ·2026-10-27

— The SEO Cover · Daily Brief · Oct 28, 2026

On "Queries are 2x faster, but we're making some event properties temporary"

PostHog is making a classic infrastructure tradeoff that will bite someone eventually: faster queries in exchange for making event properties temporary, which means you lose historical data integrity on anything that wasn't explicitly persisted. That's a real cost buried in the performance win—you're gaining speed at the expense of auditability and the ability to backfill analysis later. For product teams relying on event data as source of truth, this is the kind of optimization that looks great in benchmarks but creates problems when you need to investigate something that happened six months ago and the properties that explained it are gone. Ask your PostHog rep exactly what "temporary" means before you upgrade, because the definition will determine whether this breaks your analytics workflow.

From the source: TL;DR We're rebuilding how PostHog stores events making queries about a third faster on average, and up to 2x faster for common queries. $set , $set…

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Analytics & Measurement