Databases
OFFSET-based pagination degrades exactly where it matters: deep in a large result set.
OFFSET 10000 makes the database find and discard ten thousand rows before returning any. The cost grows with the page number.
Remember the last row seen and ask for rows after it. The query stays constant-time regardless of depth, because it seeks rather than counts.
You lose the ability to jump to an arbitrary page number. For feeds and infinite scroll that is no loss; for an admin table with page links it may be.
The slow query log tells you exactly which statements are costing you. Most people never turn it on.
Normalise until it hurts, denormalise until it works — but know which pain you are trading for.
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Server response is usually a small fraction of what a visitor experiences. The rest is in the browser, and it is measurable.
