Rust Glancer: Rust LSP using 100x less RAM

mmatklad about 9 hours ago 24 commentsRead Article on rust-glancer.github.io

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https://matklad.github.io/2026/08/21/rust-glancer.html

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Discussion (24 Comments)Read Original on HackerNews

mayli•about 2 hours ago

RA with disk cache?

matklad•about 9 hours ago

To clarify, author is https://github.com/popzxc, not me! My thoughts are here: https://matklad.github.io/2026/08/21/rust-glancer.html

dang•about 3 hours ago

Your thoughts are quite cool! but I thought featuring the project itself would make more sense for a frontpage thread, so I'm going to merge the comments (such as they are) from https://news.ycombinator.com/item?id=49392654 and add your link to the toptext above. Thanks for drawing attention to this topic!

skavi•about 4 hours ago

Waiting for RA to build up the full in memory data structure for a large workspace is so painful. Honestly, I'd just assumed that was the only way and didn't realize Rust Rover was different.

Does anyone have experience using that? Any tradeoffs?

762236•about 4 hours ago

Why don't people explain their acronyms? What is a Rust LSP?

xixixao•about 4 hours ago

People communicate with regards to the audience they expect.

This is why Rust (it’s a systems programming language) and LSP (the language server protocol invented by VS Code) are not explained in the article.

I am hoping I don’t have to define the words I used, but if in doubt, Google or ChatGPT are your friends.

762236•about 4 hours ago

It makes sense to always explain acronyms. I always do to avoid random people reaching out for more explanations

sfdlkj3jk342a•about 3 hours ago

> It makes sense to always explain acronyms.

It does up until a point. Would you say the same about "AI"? What about "LLM"?

On HN (Hacker News), I expect that most would find a definition for AI or LLM to be redundant today. LSP is borderline in my opinion, especially when the context of Rust is already given.

francislavoie•about 4 hours ago

Language Server Protocol, it's what your IDE (like VSCode or other) uses to do linting, syntax checking, and "go to reference" stuff.

Fnoord•about 3 hours ago

A Rust https://en.wikipedia.org/wiki/Language_Server_Protocol

IshKebab•about 4 hours ago

LSP is a well known term among programmers these days.

762236•about 4 hours ago

Not if an LLM writes your code. I get thousands of lines of high quality Rust per day without ever stepping into VScode.

AdieuToLogic•about 2 hours ago

> Not if an LLM writes your code. I get thousands of lines of high quality Rust per day without ever stepping into VScode.

LSPs are orthogonal to both LLMs and VSCode. For example, see Metals[0].

0 - https://metals-lsp.org/

wtetzner•about 3 hours ago

Then why not just ask the LLM to explain what LSP stands for?

nasso_dev•about 3 hours ago

what's an "LLM"? ;3

0x457•about 3 hours ago

Very little quality, let alone high-quality, code is written in VSCode.

polyaniline•about 3 hours ago

How do you know it's high quality?