startup-and-bundle-size SKILL.md skillA
startup-and-bundle-size from yuiseki/map-from-scratch is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add yuiseki/map-from-scratch/startup-and-bundle-size@git:20261026.79a684ePins git:20261026.79a684e in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- yuiseki/map-from-scratch
- Path
.agents/skills/startup-and-bundle-size/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261026.79a684e, committed Oct 26, 2026
- Size
- 22,569 bytes
- Repository stars
- 24
- License
- GPL-3.0
What map engines did to cut the bytes they ship (code, workers, WASM, fonts, decoders) and the work they do before the first frame (context, shaders, workers, parsing), what they reverted, and how that applies to a map-from-scratch renderer. Load it when a request names a page-size, download or start-up limit ("under 150 KB", "opens instantly", "slow network", "embedded widget"), when `total_gzip_bytes`, `code_gzip_bytes` or `first_frame_ms` misses its budget, or before adding a worker, a WASM…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Startup and bundle size: what ships and what runs before the first frame Two costs come before a user sees a map: the bytes downloaded (page, code, workers, WASM, fonts, data) and the work done before the first frame (context creation, shader compile and link, worker start, decoding, parsing, font loading). General engines have spent years removing both: WebGL1 paths, runtime renderer switches, eagerly bundled decoders, worker code duplicated per worker, a shader-binary cache that did not pay. In this repository the code is already small and the data is not: the browser examples ship 1-4 KB of gzipped code next to 4 KB to 17.5 MB of gzipped data, and MapLibre GL JS for the same request as 02 ships 286 KB of code and reaches its first frame in 826 ms against 02's 3.3 KB and 227 ms [1]. So the job here is mostly to keep out what engines later had to remove, and to spend the effort on data bytes and start-up work. Per-engine detail, with more numbers, is in [references/engines.md](references/engines.md). Neighbouring skills: Range reads and archive layout are in `data-range-requests`, fetch queues and caches in `tile-cache-and-loading`, glyphs in `text-rendering`. …
Read the whole file at its exact version.
How to install
mdr add yuiseki/map-from-scratch/startup-and-bundle-size@sha256:c26812f9aff342caThe line at the top of this page pins the label git:20261026.79a684e, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_5mu4j4myi3x6lkj7)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 26, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (22569 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
yuiseki/map-from-scratch · 24 stars · license GPL-3.0 · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_5mu4j4myi3x6lkj7 GET https://markdownregistry.com/api/v1/resolve?ref=yuiseki/map-from-scratch/startup-and-bundle-size GET https://markdownregistry.com/api/v1/blob/c26812f9aff342ca15acb39852c63d1a6c25755320a714dfaed2d1e30bb04686
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.