Session Replay Basics
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How Much Does Session Replay Actually Slow Down Your Site?
Session replay overhead broken into bundle size, CPU, memory, and network — and how to measure the real cost on your own app instead of trusting vendors.
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How Session Replay Works: Snapshots, Mutations, and a Lot of JSON
How session replay works under the hood: DOM snapshots, MutationObserver diffs, batched uploads, and how the player turns JSON back into a page.
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What Session Replay Actually Records (and What It Doesn't)
Session replay records DOM mutations, not video. What recorders capture, what stays invisible, and what that means for privacy and debugging.