diff --git a/Cargo.lock b/Cargo.lock
index 0988020..cf7304d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -521,6 +521,7 @@ dependencies = [
  "pathdiff",
  "radix_trie",
  "rstest",
+ "rustc-hash",
  "serde",
  "serde_json",
  "serde_with",
@@ -635,6 +636,12 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "rustc-hash"
+version = "2.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "357703d41365b4b27c590e3ed91eabb1b663f07c4c084095e60cbed4362dff0d"
+
 [[package]]
 name = "rustc_version"
 version = "0.4.1"
diff --git a/Cargo.toml b/Cargo.toml
index 77db356..6f665d6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,6 +23,7 @@ serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 serde_with = {  version = "3", features = ["indexmap_2"] }
 thiserror = "2"
+rustc-hash = "2"
 
 [dev-dependencies]
 rstest = "0.25.0"
diff --git a/src/lib.rs b/src/lib.rs
index 7f44c2d..4fec521 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,13 +6,15 @@ mod util;
 mod zip;
 
 use std::{
-    collections::{HashMap, HashSet, hash_map::Entry},
+    collections::hash_map::Entry,
+    hash::BuildHasherDefault,
     path::{Path, PathBuf},
 };
 
 use fancy_regex::Regex;
 use indexmap::IndexMap;
 use lazy_static::lazy_static;
+use rustc_hash::{FxHashMap, FxHashSet, FxHasher};
 use serde::{Deserialize, Serialize};
 use serde_with::{DefaultOnNull, serde_as};
 
@@ -68,7 +70,7 @@ pub struct PackageInformation {
     discard_from_lookup: bool,
 
     #[serde_as(as = "Vec<(_, Option<_>)>")]
-    package_dependencies: HashMap<String, Option<PackageDependency>>,
+    package_dependencies: FxHashMap<String, Option<PackageDependency>>,
 }
 
 #[serde_as]
@@ -91,21 +93,21 @@ pub struct Manifest {
     //   "name": "@app/monorepo",
     //   "workspace:."
     // }]
-    dependency_tree_roots: HashSet<PackageLocator>,
+    dependency_tree_roots: FxHashSet<PackageLocator>,
 
     // fallbackPool: [[
     //   "@app/monorepo",
     //   "workspace:.",
     // ]]
     #[serde_as(as = "Vec<(_, _)>")]
-    fallback_pool: HashMap<String, Option<PackageDependency>>,
+    fallback_pool: FxHashMap<String, Option<PackageDependency>>,
 
     // fallbackExclusionList: [[
     //   "@app/server",
     //  ["workspace:sources/server"],
     // ]]
     #[serde_as(as = "Vec<(_, _)>")]
-    fallback_exclusion_list: HashMap<String, HashSet<String>>,
+    fallback_exclusion_list: FxHashMap<String, FxHashSet<String>>,
 
     // packageRegistryData: [
     //   [null, [
@@ -115,7 +117,8 @@ pub struct Manifest {
     //   }]
     // ]
     #[serde_as(as = "Vec<(DefaultOnNull<_>, Vec<(DefaultOnNull<_>, _)>)>")]
-    package_registry_data: HashMap<String, IndexMap<String, PackageInformation>>,
+    package_registry_data:
+        FxHashMap<String, IndexMap<String, PackageInformation, BuildHasherDefault<FxHasher>>>,
 }
 
 fn parse_scoped_package_name(specifier: &str) -> Option<(String, Option<String>)> {