DevOps
Valkey-proxy: Migrating Redis Without the Rewrite
Percona's Valkey-proxy lets old Redis clients talk to clustered Valkey without a rewrite, moving the migration risk from your code to a layer you can test.
Performance
The Screen That Made Forty Requests to Render Once
Each component fetched its own slice, so one page view became forty round trips, and the waterfall was the latency rather than any single slow call, and no…
Tooling
The Flame Graph That Showed the Regex Inside the JSON Parser
The profiler turned a guess about the database into a wide bar in the serializer, and the bar was a regular expression running once per field on every row…
Performance
The Client That Opened a New Connection for Every Request
The HTTP client was constructed inside the call, so the pool was thrown away each time and every request paid the handshake, and the latency was the setup…
Performance
The 4 MB JSON Response That Compression Fixed
The API served the raw payload because the proxy only compressed text/html, and the mobile client paid for every byte of a response that shrank to nine…
Performance
The Table That Rendered Ten Thousand Rows to Show Twenty
The API returned everything and the client paginated in memory, so the DOM held ten thousand nodes, and the scroll was the layout, and the layout was the…
Deep Dive
What an Index Actually Does, and the Query It Cannot Help
The index was built and the query still scanned the table, because the predicate wrapped the column in a function, and the wrapped column is not the value…
Performance
The Stylesheet That Blocked the Render for Two Seconds
One render-blocking sheet on a third-party font service held the first paint, and the page had no content to show while the browser waited on CSS it barely…
Deep Dive
What a Connection Pool Is For, and the Setting That Ruins It
The pool was raised to two hundred to fix the timeouts, and the database got slower, because the connections were the contention rather than the cure, and…
Performance
The Loop That Read and Wrote the DOM a Thousand Times
Each iteration measured an element and then changed a style, so every read invalidated the layout and forced a synchronous reflow, and the frame budget went…
Deep Dive
Why the First Kilobytes Are the Slow Ones
A new connection starts with a congestion window of about ten packets and doubles it per round trip, so the first response is gated by the ramp rather than…
Performance
The Offset Pagination That Scanned Every Row It Skipped
The page query read and discarded ninety thousand rows to return the twenty on page four thousand, and the cost grew with the page number rather than the…