A free tool converts LLM prompt latency between ms, seconds, and minutes
TL;DR
A new browser utility converts millisecond LLM prompt durations into human-readable seconds and minutes, removing the need for manual math when reading raw API logs.
What changed
A lightweight browser utility was released that converts raw millisecond durations from LLM API logs into seconds and minutes. You paste a value, it returns a readable breakdown. That is the whole product.
Why it matters
Most vibe-built apps live or die on perceived speed. When you are iterating fast in Cursor or Claude Code, you read response times directly off the network panel or a log line, and those are almost always in milliseconds. Doing the division in your head is a small tax that adds up over a build session, and worse, it tempts you to skip the check entirely. Skipping the check is how a 4.2 second prompt ships to production unnoticed.
What to watch for
Use this as a forcing function to build a real latency view into your own app, even if it is just a tiny debug overlay during development. Track p50 and p95 per prompt template. When you A/B a system prompt or swap models, compare the distributions, not a single sample. Treat any prompt that crosses the two-second mark as a feature decision, not just a performance number, because that is the threshold where your users start to feel the wait.
Who this matters for
- Vibe Builders: Drop this into your debugging routine to instantly audit whether prompt changes in Cursor or Claude Code are causing latency spikes in your shipped MVP.
Harsh’s take
If you are shipping a Cursor-built app or a Lovable side project and still squinting at four-digit millisecond values to figure out why your agent feels slow, you are leaving real UX on the table. The tool itself is trivial; the lesson is not. You should be able to glance at any prompt and know in seconds whether you are inside or outside the patience window of your users.
Wire latency awareness into your build loop now. If your automation chain has a five-second step you did not know about, that is the step burning your activation rate. Stop guessing, measure, then cut.
by Harsh Desai
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