You’ve been busy all day, yet you feel like you’ve accomplished nothing. Your to-do list keeps growing, every task feels urgent, and you’re running from one fire to the next. You tell yourself to work harder. You end up exhausted, still stuck in the same place.
Here’s the uncomfortable truth: you might be wasting your entire life doing this.
Most people think efficiency is about “time management”—packing every minute with something. But Wu Jun, in his Silicon Valley Letters series, drops a bombshell: “The key to efficiency is simple—do fewer things.”
He reframes the whole equation. Efficiency isn’t output per hour. It’s output per lifetime. The denominator isn’t time. It’s your lifespan.
That changes everything. Low efficiency doesn’t mean you’re not doing enough. It means you’re doing the wrong things.
Think of it like gold mining. There’s two ways: one, spread all the sand under the sun and pick out each gold flake by hand. Two, use a sieve to filter out the sand, leaving only the gold.
Gold miners use the second method—they don’t miss a single flake. But life isn’t a gold mine. Your time is finite. Your goal isn’t to catch every grain. It’s to pick the biggest nuggets. If you miss a few small ones, so what? The time you save lets you find more big ones.
Wu Jun translates this into two practical formulas:
First, social efficiency = (number of connections × quality of each connection) / lifespan.
You don’t have to maintain every relationship, especially with people who repeatedly let you down. Many people hesitate to cut ties—"What if they change later?" But betting on "what if" is like examining every grain of sand. The cost is too high.
For unreliable people, don’t give a second chance. That’s one of the most important strategies for lifelong efficiency. The time you save can go into nurturing meaningful relationships with mentors and true friends. Because if your network is wide but shallow, the numerator is near zero—your efficiency is zero.
Second, task efficiency = (number of completed tasks × impact of each task) / lifespan.
Look at Johannes Gutenberg. He did one thing: invent and popularize the printing press in Europe. One thing, and it changed civilization. Compare that to Japanese inventor Yoshiro Nakamatsu, who claimed 3,200 inventions, almost none of which had real-world impact.
So before you start a task, ask yourself: Is the condition right? Will it create real impact? If you’re not sure, you’re filtering sand, not picking gold.
Quantity doesn’t matter. Impact is the multiplier. Same with relationships: choose right, not do more.
In the end, efficiency isn’t a time management problem. It’s a choice problem. Remember this: pick the gold out of the sand directly, don’t sift through every grain.
If you want to systematically improve your life’s efficiency, check out Wu Jun’s Silicon Valley Letters series. But the real takeaway is already here: do less, choose better, and let your lifetime be measured by what truly matters.