How To Reduce Rust Memory Usage?

Use `Box` for large values to move them to the heap

Use `Vec` instead of nested collections when possible

Preallocate with `Vec::with_capacity`

Shrink vectors with `shrink_to_fit`

Prefer `String` only when owned text is needed

Use `&str` and slices instead of owned data when possible

Avoid cloning; pass references instead

Use `Cow<'a, T>` to avoid unnecessary allocations

Replace `HashMap` with `BTreeMap` or arrays when appropriate

Reduce key and value sizes in maps

Use smaller integer types when valid

Pack structs to reduce padding

Reorder struct fields to minimize alignment waste

Use `Option` for niche optimization

Use `Arc` or `Rc` to share data instead of duplicating it

Use iterators and streaming instead of collecting everything

Process data in chunks or batches

Drop unused values early with scopes or `drop`

Avoid retaining references to large buffers longer than needed

Use `mem::take` or `std::mem::replace` to reuse allocations

Prefer `VecDeque` only when front removal is needed

Use `SmallVec` or `ArrayVec` for small fixed-size collections

Use `serde` borrowing with `&str` where possible

Disable unnecessary features and dependencies

Compile with `–release`

Use `jemalloc` or another allocator if beneficial

Profile memory with `heaptrack`, `valgrind`, or `pprof`

Remove debug data and logging buffers in production

Avoid recursive data structures when iterative alternatives work

Use arena allocation for many short-lived objects

Intern repeated strings or identifiers

Store indices instead of full objects when possible