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I Spawned 1000000 Goroutines. Here's Where 13 GB of RAM Went.

Nazar Boyko4d ago • 11 min read

I Spawned 1000000 Goroutines. Here's Where 13 GB of RAM Went.

Ask any Go developer what a goroutine costs and you'll get the same answer with the exact byte count...

#go#performance#programming#webdev

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Why my biggest embarrassment was also one of my greatest learning experiences in Programming!

FayazAug 24, 2026 • 10 min read

Why my biggest embarrassment was also one of my greatest learning experiences in Programming!

This is a submission for DEV's Summer Bug Smash: Smash Stories powered by Sentry. The...

#devchallenge#bugsmash#programming#performance

8 5

How I Cut a 2.1 MB JavaScript Bundle to 890 KB With Claude Code

yureki_labAug 24, 2026 • 7 min read

How I Cut a 2.1 MB JavaScript Bundle to 890 KB With Claude Code

TL;DR I had a 2.1 MB initial JavaScript bundle and a Lighthouse performance score of 41 on...

#webdev#javascript#performance#claudecode

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React WebSocket Performance: Buffer, Don't Render Every Msg

Nainik Mehta6d ago • 4 min read

React WebSocket Performance: Buffer, Don't Render Every Msg

Stop Feeding WebSocket Streams Directly to React State Hot WebSocket streams are a common...

#react#websocket#performance#javascript

3 1

Qwen3-8B on workstation Blackwell: vLLM vs SGLang vs llama.cpp, plus an FP8 pass

Jahn6d ago • 3 min read

Qwen3-8B on workstation Blackwell: vLLM vs SGLang vs llama.cpp, plus an FP8 pass

Benchmarks of the same model on the same GPU across three serving stacks, then an FP8 pass on the...

#machinelearning#cuda#performance#llm

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We measured 139 small business websites. 3% meet Google's speed threshold

Infinite Semantic Inc.4d ago • 2 min read

We measured 139 small business websites. 3% meet Google's speed threshold

Every web developer tells clients their site is too slow. I got tired of saying it without a number....

#webdev#performance#webperf#showdev

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MEROLINE LIZLENT5d ago • 4 min read

Building Performance Budgets Into Git

Performance gets worse and worse as patches are added. None of the specific PRs contribute 200ms of....

#performance#git#cicd#devops

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How I Built a Bulk Image Converter That Runs Entirely in Your Browser

Muhaymin Bin Mehmood6d ago • 5 min read

How I Built a Bulk Image Converter That Runs Entirely in Your Browser

No server uploads. No queues. Just Web Workers, OffscreenCanvas, and a lot of RAM management lessons...

#javascript#webdev#performance#showdev

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The Audit's Blind Spot: I Weighed the Build, Not the Page

Gabriel Abreu5d ago • 5 min read

The Audit's Blind Spot: I Weighed the Build, Not the Page

I published a post called "I Audited My Own Portfolio and Found 20 Problems". It was an inventory: I...

#performance#webdev#react#frontend

5 3

C++ Tool That Extracts Text From Scrolling Screen Recordings

Plexescor (Abhijot Singh)Aug 24, 2026 • 7 min read

C++ Tool That Extracts Text From Scrolling Screen Recordings

Palimpsest: I Built a C++ Tool That Extracts Text From Scrolling Screen Recordings (94%...

#ai#cpp#performance#showdev

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Redis Pipeline Contention Under Write Amplification: Batching Strategy, HOL Blocking, and the Flush Timing Problem

Neeraj Singhi2d ago • 5 min read

Redis Pipeline Contention Under Write Amplification: Batching Strategy, HOL Blocking, and the Flush Timing Problem

How Redis pipelining degrades under write amplification, why HOL blocking compounds latency, and how...

#backend#database#go#performance

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In Cassandra, a delete is a write (and reads pay for it)

Saqib Ameen SubhanAug 23, 2026 • 3 min read

In Cassandra, a delete is a write (and reads pay for it)

In Cassandra, a delete is a write. That sentence sounds like trivia until it takes down a read path...

#cassandra#database#performance#distributed

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Why Can Two Threads Writing to Different Variables Still Slow Each Other Down?

Aditya SharmaAug 24, 2026 • 4 min read

Why Can Two Threads Writing to Different Variables Still Slow Each Other Down?

Here's a situation that shouldn't be a problem. You have two threads. Each one updates its own...

#c#computerscience#hardware#performance

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I deleted my own optimization because the benchmark said it was 2.1x slower

Bijay Beezoe6d ago • 3 min read

I deleted my own optimization because the benchmark said it was 2.1x slower

I spent a day writing a NumPy kernel to replace some pandas code. It was the good kind of...

#python#performance#datascience#opensource

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Your codex exec is wasting ~900 ms per turn. I measured where.

praveen vijayanAug 24, 2026 • 2 min read

Your codex exec is wasting ~900 ms per turn. I measured where.

I spent a weekend rebuilding the JavaScript harness of OpenAI's Codex CLI on Bun. I expected a...

#bunjs#rust#typescript#performance

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How I Built a Syscall Tracer That Runs at <1% Overhead (Using eBPF)

Ojas Gupta4d ago • 6 min read

How I Built a Syscall Tracer That Runs at <1% Overhead (Using eBPF)

strace is the first tool most people reach for when a Linux process is misbehaving. Attach it to a.....

#architecture#linux#go#performance

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The sm_120 shared-memory cliff: why FP8 KV cache crashes vLLM on workstation Blackwell

Jahn6d ago • 3 min read

The sm_120 shared-memory cliff: why FP8 KV cache crashes vLLM on workstation Blackwell

If you run vLLM with --kv-cache-dtype fp8 on a DeepSeek-family (MLA) model and your GPU is a GB10, a...

#cuda#llm#gpu#performance

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MongoDB Partial Indexes: Surgical Query Planning for High-Cardinality Sparse Fields

Neeraj Singhi4d ago • 6 min read

MongoDB Partial Indexes: Surgical Query Planning for High-Cardinality Sparse Fields

How partial indexes change query plan selection, write amplification, and working-set pressure in Mo...

#backend#database#mongodb#performance

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What Actually Breaks at 1 Million Requests per Second?

Adithya Chauhan5d ago • 8 min read

What Actually Breaks at 1 Million Requests per Second?

One million HTTP requests every second sounds like a server-sizing problem: add more CPU, launch mor...

#backend#systemdesign#performance#scalability

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A GIF re-encode made the file 4.5x bigger. Interframe differencing fixed it.

이준김Aug 23, 2026 • 5 min read

A GIF re-encode made the file 4.5x bigger. Interframe differencing fixed it.

Cropping a GIF should not make it bigger. Ours did, and not by a little: a 288-frame Foucault...

#javascript#webdev#performance#webperf

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Adaptive PNG filtering made my animations 2.4x bigger

이준김Aug 24, 2026 • 6 min read

Adaptive PNG filtering made my animations 2.4x bigger

I added adaptive per-scanline filtering to an APNG encoder, because that is what you are supposed to...

#javascript#webdev#performance#webperf

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net/http Transport Internals: Connection Pool Mechanics, Dial Contention, and Tuning for Microservice Workloads

Neeraj SinghiAug 24, 2026 • 6 min read

net/http Transport Internals: Connection Pool Mechanics, Dial Contention, and Tuning for Microservice Workloads

Deep dive into Go's http.Transport connection pooling, dial serialization, idle timeout races, and p...

#go#microservices#networking#performance

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Your local RAG isn't slow — it re-reads every document on every question

Jasur Yuldoshev5d ago • 9 min read

Your local RAG isn't slow — it re-reads every document on every question

A 291-second answer over nine files, and what the llama.cpp logs said about where those seconds actu...

#rag#llm#performance#localllama

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Multi-Layer Caching for Dashboard Latency

Humza Tareen6d ago • 8 min read

Multi-Layer Caching for Dashboard Latency

HTTP Cache-Control, server-side cache with tag invalidation, React Query migration, centralized quer...

#caching#reactquery#nextjs#performance

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