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← Optimising a single metric is a trap, because the second-order…
17 connected korrents · 14 moments on record from 19 Jan 2025 to 26 Aug 2026.
Everything filed under software performance
software performance
Everything filed under code generation
code generation
Everything filed under compilers
compilers
Everything filed under benchmarks
benchmarks
Everything filed under infrastructure
infrastructure
Everything filed under health and fitness
health and fitness 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: Optimising a single metric is a trap, because the second-order consequences of the change only surface much later. Optimising a single metric is a trap, because the second-order consequences of the change only surface much later. Last stated 3 months ago
9 Jun 2026
BG
Bill Gurley — holds since 2026-06-09 — 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: Industry benchmarks are a dangerous target because every company defines the underlying metric differently. — tap to centre the map on it Industry benchmarks are a dangerous target because every company defines the underlying metric differently. Last stated 2 years ago
19 Jan 2025
EV
Elena Verna — holds since 2025-01-19 — tap for who they are
Same subject: Numbers offer a false precision: which metrics you choose to look at, and whether a five percent rise is good, are both art rather than science. — tap to centre the map on it Numbers offer a false precision: which metrics you choose to look at, and whether a five percent rise is good, are both art rather than science. Last stated 12 months ago
21 Sept 2025
JZ
Julie Zhuo — holds since 2025-09-21 — tap for who they are
Same subject: Infrastructure optimised for a single model is one architectural breakthrough away from being worthless. — tap to centre the map on it Infrastructure optimised for a single model is one architectural breakthrough away from being worthless. Last stated 10 months ago
12 Nov 2025
SN
Satya Nadella — holds since 2025-11-12 — tap for who they are
Same subject: Adoption is worth measuring first despite being a bad metric, because developers are cranky enough not to use a tool that is awful. — tap to centre the map on it Adoption is worth measuring first despite being a bad metric, because developers are cranky enough not to use a tool that is awful. Last stated 6 months ago
22 Mar 2026
NF
Nicole Forsgren — holds since 2026-03-22 — tap for who they are
Same subject: Health optimisation has overshot: minimising a measured risk is not worth it if the cost is not having lived. — tap to centre the map on it Health optimisation has overshot: minimising a measured risk is not worth it if the cost is not having lived. Last stated 2 weeks ago
26 Aug 2026
DH
David Heinemeier Hansson — holds since 2026-08-26 — tap for who they are
Same subject: The goal was never good simulation; it was answering counterfactuals, and a value function does that job as well as a simulator does. — tap to centre the map on it The goal was never good simulation; it was answering counterfactuals, and a value function does that job as well as a simulator does. Last stated 12 months ago
12 Sept 2025
SL
Sergey Levine — holds since 2025-09-12 — tap for who they are
Same subject: Evaluating a model properly would mean delaying its release, and competitive pressure means no lab will. — tap to centre the map on it Evaluating a model properly would mean delaying its release, and competitive pressure means no lab will. Last stated 2 months ago
26 Jun 2026
NB
Noam Brown — holds since 2026-06-26 — 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: 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
Same subject: A decade of arguing that software is too slow has started to work: new products are now attacking established categories on a performance pitch alone, and getting traction. — tap to centre the map on it A decade of arguing that software is too slow has started to work: new products are now attacking established categories on a performance pitch alone, and getting traction. Last stated 2 weeks ago
26 Aug 2026
CM
Casey Muratori — holds since 2026-08-26 — 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 model can now port essentially any codebase from one programming language to another, work that used to take a team over a year. — tap to centre the map on it A model can now port essentially any codebase from one programming language to another, work that used to take a team over a year. Last stated a month ago
27 Jul 2026
BC
Boris Cherny — holds since 2026-07-27 — tap for who they are
Same subject: AI acceleration threatens 'less software': without the constraint of scarce hours, even 37signals will likely build too much. — tap to centre the map on it AI acceleration threatens 'less software': without the constraint of scarce hours, even 37signals will likely build too much. Last stated a month ago
26 Jul 2026
DH
David Heinemeier Hansson — holds since 2026-07-26 — tap for who they are
Same subject: AI has made it cheap to build the features that were never worth building, so shipping a new feature every day can make a product worse rather than better. — tap to centre the map on it AI has made it cheap to build the features that were never worth building, so shipping a new feature every day can make a product worse rather than better. Last stated 2 months ago
24 Jun 2026
NE
NeetCode — holds since 2026-06-24 — tap for who they are
At the centre
Optimising a single metric is a trap, because the second-order consequences of the change only surface much later.
Holds BG Bill GurleyRead this korrent →
"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
Industry benchmarks are a dangerous target because every company defines the underlying metric differently.
Holds EV Elena Verna
Numbers offer a false precision: which metrics you choose to look at, and whether a five percent rise is good, are both art rather than science.
Holds JZ Julie Zhuo
Infrastructure optimised for a single model is one architectural breakthrough away from being worthless.
Holds SN Satya Nadella
Adoption is worth measuring first despite being a bad metric, because developers are cranky enough not to use a tool that is awful.
Holds NF Nicole Forsgren
Health optimisation has overshot: minimising a measured risk is not worth it if the cost is not having lived.
Holds
The goal was never good simulation; it was answering counterfactuals, and a value function does that job as well as a simulator does.
Holds SL Sergey Levine
Evaluating a model properly would mean delaying its release, and competitive pressure means no lab will.
Holds NB Noam Brown
"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
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
A decade of arguing that software is too slow has started to work: new products are now attacking established categories on a performance pitch alone, and getting traction.
Holds CM Casey Muratori
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 model can now port essentially any codebase from one programming language to another, work that used to take a team over a year.
Holds
AI acceleration threatens 'less software': without the constraint of scarce hours, even 37signals will likely build too much.
Holds
AI has made it cheap to build the features that were never worth building, so shipping a new feature every day can make a product worse rather than better.
Holds NE NeetCode