Ed Andersen

"Principal" developer, slightly rubbish content creator.

Views not those of employers past, present or future.

61K on YT:

[Ed Andersen @edandersen]

@cmgriffing Combine it with different colored hats

[Ed Andersen @edandersen]

Lets goooooo

[Bojan Tunguz @tunguz]

If you are into PHP, pivot to .NET.

[Ed Andersen @edandersen]

emudhra

[Ed Andersen @edandersen]

@henryjs99 Only do it if you can work for clients abroad. There is 0 internal dev market for .net here it’s all Java Ruby python etc

[Ed Andersen @edandersen]

I get straight up cold hard 2% cashback on all spend on my Sony Bank debit card in Japan

And this is the amount spent including sales tax. Way better than any "points", which actually stack on top now that visa/mc finally cracked down on different points rates for using cards

[Mariam @Gaismair]

You use a debit card at 31 years old

[Ed Andersen @edandersen]

@cmgriffing Welcome back to YouTube Mr Griffing

[Ed Andersen @edandersen]

Why is everyone worried about this “eMudhra” HTTPS man in the middle risk when Cloudflare MITMs half the internet already…

[Ed Andersen @edandersen]

@SimonHolman Thanks! Glad someone likes it!

[Ed Andersen @edandersen]

Another 1/10 woo hoo

[Ed Andersen @edandersen]

Who the hell agreed to give "eMudhra" certificate authority status

It must be deliberate

[David Crawshaw @davidcrawshaw]

Hanlon’s razor strikes again!

[Ed Andersen @edandersen]

Let's gooooo happy days!!!!

[Polymarket @Polymarket]

JUST IN: Veradermics announces its experimental hair-loss pill significantly increased hair growth in over 500 men, with no serious side effects reported in a late-stage study.

[Ed Andersen @edandersen]

My heroes all on one stage, wish I was there!

[Burke Holland @burkeholland]

Going to @GitHub Universe?

Join myself, @pierceboggan, @Jujujuliakasper, @okatiesavage and @JamesMontemagno for a look at how your team can work seamlessly with @GitHub Copilot...pretty much everywhere.

https://t.co/J90mkFkFcP

[Ed Andersen @edandersen]

@marcusash Marcus mate, IT will not leave Xbox mode available on the work PC. And this is a work PC based on the first shot. In fact, playing games on the work PC means this poor chap is going to get fired

[Ed Andersen @edandersen]

Topical

[Ryan Rodemoyer @RyanRodemoyer2]

I ported Basecamp's Campfire to C# as a drop-in replacement for the original Rails version. Then we paired agents with a profiler and what we found 33x'ing the Rails performance (and leading 3 benchmark categories over Rust and C) might surprise you.

Drop-in means you point it at your Rails Campfire's database and storage, reuse your SECRET_KEY_BASE, and everything works exactly the same. Same schema, same cookies, same HTML.

Every speedup required a real-life performance tuning loop to unlock the next 10%.

The benchmark is Basecamp's shared harness, run on one Google Cloud VM: 4 dedicated cores per app, 16 clients, every port measured twice from scratch.

196 million responses were checked against the route contracts before they counted. 0 invalid.

C# vs Rails, req/s:

Messages page: 2,183 → 71,154
Sidebar: 2,407 → 78,359
Search: 2,491 → 76,385
Room page: 2,388 → 37,115
Post a message: 265 → 2,598

Rails runs behind its Thruster proxy as shipped. C#, Rust, Go and C serve HTTP themselves.

The loop: an agent attaches the dotnet-diagnostics MCP to the container under load, finds the single biggest cost it can explain, makes one change, and proves it on the harness. Then a fresh chat starts the next round.

Most of the big wins changed a design, not a hot loop.

Why borrow when you can steal? Designs we took from the other ports:

• C: check for database changes outside the cache lock
• Rust: checkpoint when WAL pages pile up, not every commit (posting 50 → 1,449/s)
• Rust, Go, C: serve HTTP with no proxy hop (~3× on reads)

The profiler found the rest:

• read SQLite's 48-byte WAL-index header instead of querying for changes: +14–24%
• reuse HMAC and AES-GCM contexts per thread instead of .NET's one-shot calls on OpenSSL: +10–14%
• stop writing 2 log lines per request: +15–20%

A lot of the speed came from @jlchavezGT, who ran the same profiling loop on his own and sent a stack of PRs: cookie and cache-key code without throwaway strings (51 KB → 29 KB allocated per request, about +10%) and an avatar cache. Thank you, Jose.

But "C# is faster" would be the wrong takeaway. C# leads 3 workloads here because of design changes the profiler found, in the same language that started at 2–3× Rails.

C leads the room page and Rust and Go post faster. Reading C's source, its lead is design too.

The fast ports are all within about 3× of each other, and the order flips from route to route. What moved C# up was finding where the time went and changing the design, one round at a time.

Any team can run that loop.

I wrote it all up as an 11-part .NET series: https://t.co/KO652l2x8p

Try it on your laptop, then open localhost:8080:

docker run -p 8080:80 -e SECRET_KEY_BASE=$(openssl rand -hex 64) -e DISABLE_SSL=true https://t.co/cixS4wwR7P

Code, harness and every raw result, including the other ports' numbers: https://t.co/aJsoZCSQJA

Thanks to Basecamp for Campfire and the shared harness, and to everyone who built the other ports. C# got where it did because of what they figured out first.

[Ed Andersen @edandersen]

@nickchapsas https://t.co/wwdTmyijG2 wen

[Ed Andersen @edandersen]

@rick01 Sorry I refuse to use a Java app to build .NET projects 🤣

[Ed Andersen @edandersen]

This is so good I made a video about it

Yes, C# is faster than Rust ➡️ https://t.co/h23eG1BA4h

[Ibro @axeng200]

When in doubt, just use C# and https://t.co/gT6MRMoIUK Core.
It's blazing fast.

.NET 11 RC2 is even faster.

For me, it's the best overall major web framework - auth, config, logging, perf, modular middleware, DI, cross-plat, etc.

But I didn't expect this:

[Ed Andersen @edandersen]

@henryjs99 ruby devs spit on me in the street here its true

[Ed Andersen @edandersen]

@JamesSampica my god

[Ed Andersen @edandersen]

So much for the “make and sell courses” escape plan

[Sean Allen @seanallen_dev]

🚨 Going out of business sale 🚨

iOS dev course sales plummeted due to AI. It costs a lot of money to host my courses online and with sales at basically $0, I've cancelled that hosting.

This closes down the site which unfortunately removes access to the courses.

I want you to have the courses you purchased forever, so I've added the ability to download my course videos so they are yours.

I've put my recent course on sale at a large discount so you can get it before it's gone and I've made old courses available for free if you want to grab those too.

The school will be online until November 24th so you have a few weeks to download these videos at https://t.co/deQ3SY7LW3

Thanks for learning with me and supporting my work over the years. I appreciate it.