---
title: "aadhar.sh/garage/5.6 sol"
description: "The performance pass planned with 5.6 Sol: the bytes, cache boundaries and first-paint calls that make aadhar.sh feel instant and still look like XP."
path: "/garage/gpt56"
section: "garage"
kind: "content"
updated: "2026-07-10"
source: "https://aadhar.sh/garage/gpt56"
---

> Site index: https://aadhar.sh/llms.txt
> Section index: https://aadhar.sh/garage/llms.txt
> This is the Markdown twin of a page on aadhar.sh. The HTML at the source
> URL below is the original, and is hand-written and unminified on purpose.

# 5.6 Sol's performance pass

A morning review produced a long list of ways to make this site faster. The useful part was not a rewrite: it was moving bytes out of [first paint](https://developer.mozilla.org/en-US/docs/Glossary/First_paint), giving every cacheable thing a stable identity, and making the deploy fail before a regression reaches the [edge](https://en.wikipedia.org/wiki/Edge_computing).

This page is the shop card for that pass. “5.6 Sol” is the reviewer; the evidence is the code, the build gate, and the Chrome trace below. No benchmark theatre, no invented [p75](https://en.wikipedia.org/wiki/Percentile).

trace readout

**136 ms**

LCP · localhost trace  
CLS 0.00  
0 external fonts  
64.74 KiB worker gzip

Tags: first paint, immutable bytes, deploy gate, field p75 pending

### Clear first paint

Static desktop markup, a tiny critical shell, native fonts, and no [render-blocking](https://developer.mozilla.org/en-US/docs/Glossary/Render_blocking) JavaScript. The page can look like itself before the deferred nav arrives.

### Give bytes a name

Hashed thumbnails, honest 404s, edge-direct assets, and cache keys that change when bytes change. A cache hit is only useful when it is the right file.

### Make shipping fail loud

Build-time invariants, [minified](https://en.wikipedia.org/wiki/Minification_(programming)) shell budgets, readable source twins, and a route oracle. The fast path includes proving that the fast path shipped.

## performance workbench / three checks

CHECK 01 · FIRST PAINT

Pick a layer of the tune-up. The readout is deliberately small: one concrete decision, one thing to measure, one thing that can still go wrong.

### Make the first frame honest

Keep the desktop and window geometry in the document, [preload](https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Attributes/rel/preload) the shared Luna sheet, and defer the shell behavior. The browser paints the identity before JavaScript has had a chance to help.

## What actually made it onto the lift

| brief | garage translation |
| --- | --- |
| shell + CSS | `luna.css` is one shared, cacheable sheet; the desktop shell is static markup; `nav.js` stays deferred and ships minified with a readable twin. |
| photo bytes | Thumbnails are [content-addressed](https://en.wikipedia.org/wiki/Content-addressable_storage) and [immutable](https://www.rfc-editor.org/rfc/rfc8246.html); the first homepage slot is the designed [LCP](https://developer.mozilla.org/en-US/docs/Glossary/Largest_contentful_paint), with dimensions reserved and the rest lazy. |
| edge work | Static assets answer directly; Worker routes are explicit; [KV](https://developers.cloudflare.com/kv/)-backed work uses [stale-while-revalidate](https://www.rfc-editor.org/rfc/rfc5861.html) instead of holding the document hostage. |
| proof before deploy | The build parses CSS, checks the route mirror, caps the [gzip](https://en.wikipedia.org/wiki/Gzip) bundle, and keeps `/*.src.*` twins so performance never costs View Source. |

**The honesty rule:** 136ms LCP and 0.00 [CLS](https://developer.mozilla.org/en-US/docs/Glossary/CLS) are from a local, unthrottled Chrome trace of this page—not field p75. The next useful measurement is a cold, slow-4G run against production, then a real-device check. A plan is not a result until the browser agrees.

The long-form design ledger lives in [Blueprint](https://aadhar.sh/garage/blueprint); the byte-level history is in [Bytes on the wire](https://aadhar.sh/garage/wire). [Back to the garage](https://aadhar.sh/garage).

Source: https://aadhar.sh/garage/gpt56