Zed Improved. Aiming to improve upon Zed and make a truly delightful code editor. https://zed.dev
Find a file
Ben Brandt 4ece4a635f
extension_host: Use wasmtime incremental compilation (#30948)
Builds on top of https://github.com/zed-industries/zed/pull/30942

This turns on incremental compilation and decreases extension
compilation times by up to another 41%
Putting us at roughly 92% improved extension load times from what is in
the app today.

Because we only have a static engine, I can't reset the cache between
every run. So technically the benchmarks are always running with a
warmed cache. So the first extension we load will take the 8.8ms, and
then any subsequent extensions will be closer to the measured time in
this benchmark.

This is also measuring the entire load process, not just the
compilation. However, since this is the loading we likely think of when
thinking about extensions, I felt it was likely more helpful to see the
impact on the overall time.

This works because our extensions are largely the same Wasm bytecode
(SDK code + std lib functions etc) with minor changes in the trait impl.
The more different that extensions implementation is, there will be less
benefit, however, there will always be a large part of every extension
that is always the same across extensions, so this should be a speedup
regardless.

I used `moka` to provide a bound to the cache. We could use a bare
`DashMap`, however if there was some issue this could lead to a memory
leak. `moka` has some slight overhead, but makes sure that we don't go
over 32mb while using an LRU-style mechanism for deciding which
compilation artifacts to keep.

I measured our current extensions to take roughly 512kb in the cache.
Which means with a cap of 32mb, we can keep roughly 64 *completely
novel* extensions with no overlap. Since our extensions will have more
overlap than this though, we can actually keep much more in the cache
without having to worry about it.

#### Before:

```
load/1                  time:   [8.8301 ms 8.8616 ms 8.8931 ms]
                        change: [-0.1880% +0.3221% +0.8679%] (p = 0.23 > 0.05)
                        No change in performance detected.
```

#### After:

```
load/1                  time:   [5.1575 ms 5.1726 ms 5.1876 ms]
                        change: [-41.894% -41.628% -41.350%] (p = 0.00 < 0.05)
                        Performance has improved.
```

Release Notes:

- N/A
2025-05-21 10:12:16 +02:00
.cargo build: Remove -all_load linker argument on macOS (#30656) 2025-05-17 07:20:23 +02:00
.cloudflare docs: Document context servers (#21170) 2024-11-25 11:05:14 -05:00
.config workspace-hack: remove openssl from remote_server (#27990) 2025-04-03 00:49:07 +00:00
.github Fix command casing in issue templates (#30761) 2025-05-15 12:15:27 +00:00
.zed debugger: Fix inline values panic when selecting stack frames (#30821) 2025-05-16 15:42:09 +02:00
assets sublime: Don't map editor::FindNextMatch by default (#31029) 2025-05-20 17:52:11 +00:00
crates extension_host: Use wasmtime incremental compilation (#30948) 2025-05-21 10:12:16 +02:00
docs language_models: Add tool use support for Mistral models (#29994) 2025-05-19 18:36:59 +02:00
extensions Run additional checks from script/clippy if local (#29768) 2025-05-02 01:26:12 +00:00
legal Legal Terms: May 6th 2025 update (#30151) 2025-05-07 17:14:02 +00:00
nix nix: Add libX11 dependency for X11 support (#28938) 2025-04-17 12:58:45 -07:00
script Legal Terms: May 6th 2025 update (#30151) 2025-05-07 17:14:02 +00:00
tooling extension_host: Use wasmtime incremental compilation (#30948) 2025-05-21 10:12:16 +02:00
.clinerules Initial .rules file for agent with symlinks for other rules file paths (#29014) 2025-04-17 23:41:23 +00:00
.cursorrules Initial .rules file for agent with symlinks for other rules file paths (#29014) 2025-04-17 23:41:23 +00:00
.git-blame-ignore-revs Add PR 15352 to .git-blame-ignore-revs (#30870) 2025-05-17 11:35:58 +00:00
.gitattributes Prevent GitHub from displaying comments within JSON files as errors (#7043) 2024-01-29 23:11:25 -05:00
.gitignore Update nixpkgs, add direnv to gitignore (#30292) 2025-05-13 01:45:22 -07:00
.mailmap Update .mailmap (#30874) 2025-05-17 12:34:42 +00:00
.prettierrc ci: Add check for formatting default.json (#30034) 2025-05-06 18:55:26 +00:00
.rules Add missing "no" in .rules (#30748) 2025-05-17 06:31:56 +00:00
.windsurfrules Initial .rules file for agent with symlinks for other rules file paths (#29014) 2025-04-17 23:41:23 +00:00
Cargo.lock extension_host: Use wasmtime incremental compilation (#30948) 2025-05-21 10:12:16 +02:00
Cargo.toml extension_host: Use wasmtime incremental compilation (#30948) 2025-05-21 10:12:16 +02:00
CLAUDE.md Initial .rules file for agent with symlinks for other rules file paths (#29014) 2025-04-17 23:41:23 +00:00
clippy.toml Restructure agent context (#29233) 2025-04-24 21:29:33 +00:00
CODE_OF_CONDUCT.md Remove community content from docs and point to zed.dev (#19895) 2024-10-29 09:44:58 -04:00
compose.yml Add Postgrest to Docker Compose (#16498) 2024-08-19 20:50:45 -04:00
CONTRIBUTING.md Allow icon themes to provide their own file associations (#24926) 2025-02-15 00:35:13 +00:00
Cross.toml Add remote server cross compilation (#19136) 2024-10-12 23:23:56 -07:00
debug.plist WIP 2023-12-14 09:25:14 -07:00
default.nix Fix nix build (#26270) 2025-03-10 01:06:11 -07:00
docker-compose.sql collab: Setup database for LLM service (#15882) 2024-08-06 17:18:08 -04:00
Dockerfile-collab chore: Bump Rust to 1.87 (#30739) 2025-05-15 22:28:52 +00:00
Dockerfile-collab.dockerignore ci: Move collab to Dockerfile-collab (#18515) 2024-09-30 16:14:26 -04:00
Dockerfile-cross Add remote server cross compilation (#19136) 2024-10-12 23:23:56 -07:00
Dockerfile-cross.dockerignore Add remote server cross compilation (#19136) 2024-10-12 23:23:56 -07:00
Dockerfile-distros Support More Linux (#18480) 2024-09-30 17:46:21 -04:00
Dockerfile-distros.dockerignore Support More Linux (#18480) 2024-09-30 17:46:21 -04:00
flake.lock build: Remove -all_load linker argument on macOS (#30656) 2025-05-17 07:20:23 +02:00
flake.nix Update nixpkgs, add direnv to gitignore (#30292) 2025-05-13 01:45:22 -07:00
LICENSE-AGPL Update license year (#24191) 2025-02-04 09:02:59 -05:00
LICENSE-APACHE Update license year (#24191) 2025-02-04 09:02:59 -05:00
LICENSE-GPL Licenses: change license fields in Cargo.toml to AGPL-3.0-or-later. (#5535) 2024-01-27 13:51:16 +01:00
livekit.yaml Add LiveKit server to Docker Compose (#7907) 2024-02-16 10:49:48 -05:00
Procfile Refactor: Restructure collab main function to prepare for new subcommand: serve llm (#15824) 2024-08-05 12:07:38 -07:00
Procfile.postgrest Fix llm queries (#16006) 2024-08-08 17:21:38 -07:00
README.md Remove Repology badge from README (#30857) 2025-05-17 07:01:46 +00:00
renovate.json renovate: Require dependency dashboard approval for updates (#29065) 2025-04-18 18:44:30 +00:00
rust-toolchain.toml chore: Bump Rust to 1.87 (#30739) 2025-05-15 22:28:52 +00:00
shell.nix Fix nix build (#26270) 2025-03-10 01:06:11 -07:00
typos.toml editor: Handle more completion sort cases (#30690) 2025-05-14 18:49:39 +05:30

Zed

CI

Welcome to Zed, a high-performance, multiplayer code editor from the creators of Atom and Tree-sitter.


Installation

On macOS and Linux you can download Zed directly or install Zed via your local package manager.

Other platforms are not yet available:

Developing Zed

Contributing

See CONTRIBUTING.md for ways you can contribute to Zed.

Also... we're hiring! Check out our jobs page for open roles.

Licensing

License information for third party dependencies must be correctly provided for CI to pass.

We use cargo-about to automatically comply with open source licenses. If CI is failing, check the following:

  • Is it showing a no license specified error for a crate you've created? If so, add publish = false under [package] in your crate's Cargo.toml.
  • Is the error failed to satisfy license requirements for a dependency? If so, first determine what license the project has and whether this system is sufficient to comply with this license's requirements. If you're unsure, ask a lawyer. Once you've verified that this system is acceptable add the license's SPDX identifier to the accepted array in script/licenses/zed-licenses.toml.
  • Is cargo-about unable to find the license for a dependency? If so, add a clarification field at the end of script/licenses/zed-licenses.toml, as specified in the cargo-about book.