Re "is fast as can be": in my experience generating C/Zig code via Codex, agent generated code is usually several multiples slower than hand optimized code.
Yeah, I’m sure my Claude generated email client could be even faster if I wrote it by hand. Modern computers can retire billions of instructions per second per core. All operations that aren’t downloading or processing gigabytes of data should be instant on modern computers.
Claude’s toy email client gets closer to the speed limit than Gmail does. Why is Gmail so slow? I have no idea.
Look, it's an RSS reader, not a numeric solver for PDEs. What I clearly meant was: Every interaction is instant, no noticable delay at all, except the reader view, which makes a network request to an external site.
Hey, sorry, I just have to defuse assumptions people make when they see Rust, LLMs, and "as fast as can be" in short proximity. Your project is obviously cool, and I don't think the fact that it's likely still multiples more resource intensive than an absolutely minimal version takes away from that.
you have to ask it to profile and optimize the code for you. Then have it document the changes and run it in a loop. It’ll do wonders.
I asked a cursor agent to do the same for a geotiff to pmtiles converter. It managed to optimize the performance from tens of days to half a day for the case I wanted to solve.
Given parent and GP are both using Claude... have you tried Claude? (I say this as someone who has not tried Claude recently. I did try Claude Code when it first came out, though.)
First, it is important for these discussions that people include details like I did. We're all better off to not generalize.
RE: Claude Code, no I haven't used it, but I did do the Anthropic interview problem, beating all of Anthropic's reported Claude scores even with custom harnesses etc.
It's not a dunk that agents can't produce "as fast as can be" code; their code is usually still reasonably fast; it's just often 2-10x slower than can be.
josephg|6 days ago
Claude’s toy email client gets closer to the speed limit than Gmail does. Why is Gmail so slow? I have no idea.
srcreigh|6 days ago
mr_mitm|6 days ago
srcreigh|6 days ago
__mp|6 days ago
I asked a cursor agent to do the same for a geotiff to pmtiles converter. It managed to optimize the performance from tens of days to half a day for the case I wanted to solve.
LoganDark|6 days ago
srcreigh|6 days ago
RE: Claude Code, no I haven't used it, but I did do the Anthropic interview problem, beating all of Anthropic's reported Claude scores even with custom harnesses etc.
It's not a dunk that agents can't produce "as fast as can be" code; their code is usually still reasonably fast; it's just often 2-10x slower than can be.