How to reduce memory usage?

[Demkeys]

When I open up an empty Bevy project in nvim, rust-analyzer takes up around 5.7GB of memory. When I do "cargo run", ld takes up around 3GB. Sometimes rustc usage goes up to GBs as well.

The best machine I have only has 12GB of RAM, and 3-4GB of that is already taken up. I'm wondering if there is any way I can reduce the memory usage in any of those areas.

Bevy version: 0.17.13
rustc version: 1.89.0
OS: Ubuntu
IDE: nvim (LazyVim)

[anntnzrb]

To reduce memory usage during Bevy development:

1. Copy .cargo/config_fast_builds.toml to .cargo/config.toml in your project - this enables mold linker (Linux) which reduces linking memory: uncomment -Clink-arg=-fuse-ld=mold after installing with sudo apt-get install mold clang.

2. Disable unused Bevy features in Cargo.toml to reduce compilation footprint:

   bevy = { version = "0.17", default-features = false, features = ["2d"] }

   Or use dynamic_linking feature during development for faster iterative builds: features = ["dynamic_linking"] (see docs/cargo_features.md in repo).

3. For rust-analyzer: Add to .vscode/settings.json or neovim config:

   "rust-analyzer.cargo.features": ["dynamic_linking"],
   "rust-analyzer.checkOnSave.allTargets": false

4. Limit parallel jobs - add to .cargo/config.toml:

   [build]
   jobs = 2  # Reduces peak memory by limiting concurrent rustc processes

These settings are from Bevy's official config_fast_builds.toml and docs/cargo_features.md in bevyengine/bevy repo.