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← You only really know something once you have built it — blog posts and…
17 connected korrents · 14 moments on record from 20 Aug 2024 to 3 Sept 2026.
Everything filed under compilers
compilers
Everything filed under benchmarks
benchmarks
Everything filed under software performance
software performance Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Read this korrent: You only really know something once you have built it — blog posts and slides leave gaps that building the thing does not. You only really know something once you have built it — blog posts and slides leave gaps that building the thing does not. Last stated 11 months ago
17 Oct 2025
AK
Andrej Karpathy — holds since 2025-10-17 — tap for who they are
Same subject: The hard part of building a product in a month is working out what not to build. — tap to centre the map on it The hard part of building a product in a month is working out what not to build. Last stated 2 years ago
20 Aug 2024
PL
Pieter Levels — holds since 2024-08-20 — tap for who they are
Same subject: You should build by solving only the next problem in front of you; most people fail because they look too far ahead. — tap to centre the map on it You should build by solving only the next problem in front of you; most people fail because they look too far ahead. Last stated 2 years ago
20 Aug 2024
PL
Pieter Levels — holds since 2024-08-20 — tap for who they are
Same subject: Now that anyone can build fast, the hardest problem in starting something is not the tech, the software or the people, but getting attention. — tap to centre the map on it Now that anyone can build fast, the hardest problem in starting something is not the tech, the software or the people, but getting attention. Last stated 4 weeks ago
10 Aug 2026
PS
Peter Steinberger — holds since 2026-08-10 — tap for who they are
Same subject: Redefining the engineer's job as building guardrails is not novel — it is the same problem as making a junior engineer effective, which we never solved either. — tap to centre the map on it Redefining the engineer's job as building guardrails is not novel — it is the same problem as making a junior engineer effective, which we never solved either. Last stated 3 months ago
27 May 2026
DR
Dax Raad — holds since 2026-05-27 — tap for who they are
Same subject: To actually understand a piece of technology, rebuild it from scratch rather than read about it. — tap to centre the map on it To actually understand a piece of technology, rebuild it from scratch rather than read about it. Last stated a year ago
22 Mar 2025
TH
ThePrimeagen — holds since 2025-03-22 — tap for who they are
Same subject: You have to be user number one: if you are not excited by the thing you are building, it will probably not be any good. — tap to centre the map on it You have to be user number one: if you are not excited by the thing you are building, it will probably not be any good. Last stated 4 weeks ago
10 Aug 2026
PS
Peter Steinberger — holds since 2026-08-10 — tap for who they are
Same subject: You do not have to know how it works underneath, but depth is where invention comes from — nobody who only knows the surface invents a programming language. — tap to centre the map on it You do not have to know how it works underneath, but depth is where invention comes from — nobody who only knows the surface invents a programming language. Last stated 3 months ago
3 Jun 2026
KH
Kelsey Hightower — holds since 2026-06-03 — tap for who they are
Same subject: What you have to invent is the whole system around a product, including how it is sold, bought and installed, not the one piece people remember. — tap to centre the map on it What you have to invent is the whole system around a product, including how it is sold, bought and installed, not the one piece people remember. Last stated 3 months ago
7 Jun 2026
TF
Tony Fadell — holds since 2026-06-07 — tap for who they are
Same subject: A compiler that also serves an IDE has to be lazy and deferred throughout — a different way of building compilers from the one the textbooks teach. — tap to centre the map on it A compiler that also serves an IDE has to be lazy and deferred throughout — a different way of building compilers from the one the textbooks teach. Last stated 4 months ago
13 May 2026
AH
Anders Hejlsberg — holds since 2026-05-13 — tap for who they are
Same subject: A compiler that names every place a change breaks turns refactoring into fixing errors until the compiler stops shouting. — tap to centre the map on it A compiler that names every place a change breaks turns refactoring into fixing errors until the compiler stops shouting. Last stated 4 months ago
20 May 2026
AR
Alice Ryhl — holds since 2026-05-20 — tap for who they are
Same subject: A programming language is not a compiler but an experience: editing, running, debugging and the runtime library all have to fit together as one cycle. — tap to centre the map on it A programming language is not a compiler but an experience: editing, running, debugging and the runtime library all have to fit together as one cycle. Last stated 4 months ago
13 May 2026
AH
Anders Hejlsberg — holds since 2026-05-13 — tap for who they are
Same subject: A benchmark result should be reported under a stated budget, or as a curve against test-time compute — never as a single number. — tap to centre the map on it A benchmark result should be reported under a stated budget, or as a curve against test-time compute — never as a single number. Last stated 2 months ago
26 Jun 2026
NB
Noam Brown — holds since 2026-06-26 — tap for who they are
Same subject: A benchmark that ranks Claude Code last while it stays first in use is measuring the wrong thing, and has been for a year. — tap to centre the map on it A benchmark that ranks Claude Code last while it stays first in use is measuring the wrong thing, and has been for a year. Last stated 5 days ago
3 Sept 2026
DR
Dax Raad — holds since 2026-09-03 — tap for who they are
Same subject: A company's staff-engineer bar should be set against the best companies in the industry rather than against its own history, which is what makes title inflation a real cost. — tap to centre the map on it A company's staff-engineer bar should be set against the best companies in the industry rather than against its own history, which is what makes title inflation a real cost. Last stated 5 months ago
1 Apr 2026
TP
Thuan Pham — holds since 2026-04-01 — tap for who they are
Same subject: "Is the page loaded?" was never a real question, and web performance only became measurable once it was broken into the distinct moments a user actually notices. — tap to centre the map on it "Is the page loaded?" was never a real question, and web performance only became measurable once it was broken into the distinct moments a user actually notices. Last stated 3 weeks ago
19 Aug 2026
AO
Addy Osmani — holds since 2026-08-19 — tap for who they are
Same subject: "Optimize it later" would be safe advice only if every engineer already knew how to avoid the architectural mistakes that no later optimization can remove. — tap to centre the map on it "Optimize it later" would be safe advice only if every engineer already knew how to avoid the architectural mistakes that no later optimization can remove. Last stated 2 weeks ago
26 Aug 2026
CM
Casey Muratori — holds since 2026-08-26 — tap for who they are
Same subject: A 300-millisecond response budget is not an achievement but an admission: 300 milliseconds is an eternity in computing, and a product pitching it shows how far the bar has fallen. — tap to centre the map on it A 300-millisecond response budget is not an achievement but an admission: 300 milliseconds is an eternity in computing, and a product pitching it shows how far the bar has fallen. Last stated 2 weeks ago
26 Aug 2026
CM
Casey Muratori — holds since 2026-08-26 — tap for who they are
At the centre
You only really know something once you have built it — blog posts and slides leave gaps that building the thing does not.
Holds Read this korrent →
The hard part of building a product in a month is working out what not to build.
Holds
You should build by solving only the next problem in front of you; most people fail because they look too far ahead.
Holds
Now that anyone can build fast, the hardest problem in starting something is not the tech, the software or the people, but getting attention.
Holds
Redefining the engineer's job as building guardrails is not novel — it is the same problem as making a junior engineer effective, which we never solved either.
Holds
To actually understand a piece of technology, rebuild it from scratch rather than read about it.
Holds TH ThePrimeagen
You have to be user number one: if you are not excited by the thing you are building, it will probably not be any good.
Holds
You do not have to know how it works underneath, but depth is where invention comes from — nobody who only knows the surface invents a programming language.
Holds KH Kelsey Hightower
What you have to invent is the whole system around a product, including how it is sold, bought and installed, not the one piece people remember.
Holds TF Tony Fadell
A compiler that also serves an IDE has to be lazy and deferred throughout — a different way of building compilers from the one the textbooks teach.
Holds AH Anders Hejlsberg
A compiler that names every place a change breaks turns refactoring into fixing errors until the compiler stops shouting.
Holds AR Alice Ryhl
A programming language is not a compiler but an experience: editing, running, debugging and the runtime library all have to fit together as one cycle.
Holds AH Anders Hejlsberg
A benchmark result should be reported under a stated budget, or as a curve against test-time compute — never as a single number.
Holds NB Noam Brown
A benchmark that ranks Claude Code last while it stays first in use is measuring the wrong thing, and has been for a year.
Holds
A company's staff-engineer bar should be set against the best companies in the industry rather than against its own history, which is what makes title inflation a real cost.
Holds TP Thuan Pham
"Is the page loaded?" was never a real question, and web performance only became measurable once it was broken into the distinct moments a user actually notices.
Holds AO Addy Osmani
"Optimize it later" would be safe advice only if every engineer already knew how to avoid the architectural mistakes that no later optimization can remove.
Holds CM Casey Muratori
A 300-millisecond response budget is not an achievement but an admission: 300 milliseconds is an eternity in computing, and a product pitching it shows how far the bar has fallen.
Holds CM Casey Muratori