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← "Optimize it later" would be safe advice only if every engineer…
17 connected korrents · 12 moments on record from 1 May 2003 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 JavaScript
JavaScript
Everything filed under infrastructure
infrastructure
Everything filed under design
design
Everything filed under AI alignment
AI alignment 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: "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. "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: Hand-optimizing hot spots barely matters any more, because the libraries are already fast and CPUs are extremely good at running bad code quickly; what is left is architecture. — tap to centre the map on it Hand-optimizing hot spots barely matters any more, because the libraries are already fast and CPUs are extremely good at running bad code quickly; what is left is architecture. Last stated 2 weeks ago
26 Aug 2026
CM
Casey Muratori — holds since 2026-08-26 — 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: Everyone on a team who makes architectural decisions must understand performance, because a codebase that can be optimized later only ends up that way on purpose. — tap to centre the map on it Everyone on a team who makes architectural decisions must understand performance, because a codebase that can be optimized later only ends up that way on purpose. Last stated 2 weeks ago
26 Aug 2026
CM
Casey Muratori — holds since 2026-08-26 — tap for who they are
Same subject: Premature design, deciding too early what a program should do, is as dangerous as premature optimization; specifications should be allowed to change on the fly. — tap to centre the map on it Premature design, deciding too early what a program should do, is as dangerous as premature optimization; specifications should be allowed to change on the fly. Last stated 23 years ago
1 May 2003
PG
Paul Graham — holds since 2003-05-01 — tap for who they are
Same subject: Nobody has found keeping specs and code in sync worth the upkeep; the code stays the source of truth. — tap to centre the map on it Nobody has found keeping specs and code in sync worth the upkeep; the code stays the source of truth. Last stated 2 months ago
15 Jul 2026
DH
Dex Horthy — holds since 2026-07-15 — tap for who they are
Same subject: The programming practices taught as best practice are ruinous for performance and should not be followed. — tap to centre the map on it The programming practices taught as best practice are ruinous for performance and should not be followed. Last stated 4 years ago
28 Feb 2023
CM
Casey Muratori — holds since 2023-02-28 — tap for who they are
Same subject: The steady stream of "we had to rewrite the whole thing because it was too slow" engineering blog posts is the proof that deferring performance to hotspot optimization does not work. — tap to centre the map on it The steady stream of "we had to rewrite the whole thing because it was too slow" engineering blog posts is the proof that deferring performance to hotspot optimization does not work. Last stated 2 weeks ago
26 Aug 2026
CM
Casey Muratori — holds since 2026-08-26 — tap for who they are
Same subject: There is no route to AI alignment or safety that goes around reliability: a system that cannot reliably follow a known algorithm cannot be made safe. — tap to centre the map on it There is no route to AI alignment or safety that goes around reliability: a system that cannot reliably follow a known algorithm cannot be made safe. Last stated a year ago
7 Jun 2025
GM
Gary Marcus — holds since 2025-06-07 — 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-written code makes formal proof necessary, because human review of all that generated code becomes the bottleneck. — tap to centre the map on it AI-written code makes formal proof necessary, because human review of all that generated code becomes the bottleneck. Last stated 5 months ago
22 Apr 2026
MK
Martin Kleppmann — holds since 2026-04-22 — tap for who they are
Same subject: Every time software has become easier to create, the world has created exponentially more of it, and this time will be no exception. — tap to centre the map on it Every time software has become easier to create, the world has created exponentially more of it, and this time will be no exception. Last stated 3 weeks ago
19 Aug 2026
AO
Addy Osmani — holds since 2026-08-19 — 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 proprietary language licensed from Microsoft had zero chance in the JavaScript ecosystem: TypeScript had to be open source or nobody would come. — tap to centre the map on it A proprietary language licensed from Microsoft had zero chance in the JavaScript ecosystem: TypeScript had to be open source or nobody would come. Last stated 4 months ago
13 May 2026
AH
Anders Hejlsberg — holds since 2026-05-13 — tap for who they are
Same subject: Because its types are erased before the program runs, TypeScript can afford not to be sound: checking 99% beats the 0% JavaScript checked, and buys features a sound language cannot offer. — tap to centre the map on it Because its types are erased before the program runs, TypeScript can afford not to be sound: checking 99% beats the 0% JavaScript checked, and buys features a sound language cannot offer. Last stated 4 months ago
13 May 2026
AH
Anders Hejlsberg — holds since 2026-05-13 — tap for who they are
Same subject: Fiscal multipliers vary across time and place but are generally nonzero, positive for spending, negative for taxes, and larger when monetary policy cannot offset them. — tap to centre the map on it Fiscal multipliers vary across time and place but are generally nonzero, positive for spending, negative for taxes, and larger when monetary policy cannot offset them. Last stated 4 years ago
1 Jun 2022
OB
Olivier Blanchard — holds since 2022-06-01 — tap for who they are
At the centre
"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 MuratoriRead this korrent →
Hand-optimizing hot spots barely matters any more, because the libraries are already fast and CPUs are extremely good at running bad code quickly; what is left is architecture.
Holds CM Casey Muratori
Infrastructure optimised for a single model is one architectural breakthrough away from being worthless.
Holds SN Satya Nadella
Everyone on a team who makes architectural decisions must understand performance, because a codebase that can be optimized later only ends up that way on purpose.
Holds CM Casey Muratori
Premature design, deciding too early what a program should do, is as dangerous as premature optimization; specifications should be allowed to change on the fly.
Holds
Nobody has found keeping specs and code in sync worth the upkeep; the code stays the source of truth.
Holds DH Dex Horthy
The programming practices taught as best practice are ruinous for performance and should not be followed.
Holds CM Casey Muratori
The steady stream of "we had to rewrite the whole thing because it was too slow" engineering blog posts is the proof that deferring performance to hotspot optimization does not work.
Holds CM Casey Muratori
There is no route to AI alignment or safety that goes around reliability: a system that cannot reliably follow a known algorithm cannot be made safe.
Holds GM Gary Marcus
AI acceleration threatens 'less software': without the constraint of scarce hours, even 37signals will likely build too much.
Holds
AI-written code makes formal proof necessary, because human review of all that generated code becomes the bottleneck.
Holds MK Martin Kleppmann
Every time software has become easier to create, the world has created exponentially more of it, and this time will be no exception.
Holds AO Addy Osmani
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 proprietary language licensed from Microsoft had zero chance in the JavaScript ecosystem: TypeScript had to be open source or nobody would come.
Holds AH Anders Hejlsberg
Because its types are erased before the program runs, TypeScript can afford not to be sound: checking 99% beats the 0% JavaScript checked, and buys features a sound language cannot offer.
Holds AH Anders Hejlsberg
Fiscal multipliers vary across time and place but are generally nonzero, positive for spending, negative for taxes, and larger when monetary policy cannot offset them.
Holds