diff --git a/Cargo.lock b/Cargo.lock
index 9a7a6b8cc..48fa88f8b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -30,6 +30,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "77c3a9648d43b9cd48db467b3f87fdd6e146bcc88ab0180006cef2179fe11d01"
 dependencies = [
  "cfg-if",
+ "getrandom",
  "once_cell",
  "version_check",
  "zerocopy",
@@ -44,12 +45,6 @@ dependencies = [
  "memchr",
 ]
 
-[[package]]
-name = "allocator-api2"
-version = "0.2.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0942ffc6dcaadf03badf6e6a2d0228460359d5e34b57ccdc720b7382dfbd5ec5"
-
 [[package]]
 name = "anes"
 version = "0.1.6"
@@ -70,7 +65,7 @@ checksum = "a66537f1bb974b254c98ed142ff995236e81b9d0fe4db0575f46612cb15eb0f9"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.47",
+ "syn",
 ]
 
 [[package]]
@@ -167,39 +162,6 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a2bd12c1caf447e69cd4528f47f94d203fd2582878ecb9e9465484c4148a8223"
 
-[[package]]
-name = "cached"
-version = "0.47.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "69b0116662497bc24e4b177c90eaf8870e39e2714c3fcfa296327a93f593fc21"
-dependencies = [
- "ahash",
- "cached_proc_macro",
- "cached_proc_macro_types",
- "hashbrown",
- "instant",
- "once_cell",
- "thiserror",
-]
-
-[[package]]
-name = "cached_proc_macro"
-version = "0.18.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c878c71c2821aa2058722038a59a67583a4240524687c6028571c9b395ded61f"
-dependencies = [
- "darling",
- "proc-macro2",
- "quote",
- "syn 1.0.109",
-]
-
-[[package]]
-name = "cached_proc_macro_types"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3a4f925191b4367301851c6d99b09890311d74b0d43f274c0b34c86d308a3663"
-
 [[package]]
 name = "cast"
 version = "0.3.0"
@@ -290,6 +252,7 @@ dependencies = [
  "once_cell",
  "oorandom",
  "plotters",
+ "rayon",
  "regex",
  "serde",
  "serde_derive",
@@ -309,39 +272,29 @@ dependencies = [
 ]
 
 [[package]]
-name = "darling"
-version = "0.14.4"
+name = "crossbeam-deque"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b750cb3417fd1b327431a470f388520309479ab0bf5e323505daf0290cd3850"
+checksum = "613f8cc01fe9cf1a3eb3d7f488fd2fa8388403e97039e2f73692932e291a770d"
 dependencies = [
- "darling_core",
- "darling_macro",
+ "crossbeam-epoch",
+ "crossbeam-utils",
 ]
 
 [[package]]
-name = "darling_core"
-version = "0.14.4"
+name = "crossbeam-epoch"
+version = "0.9.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "109c1ca6e6b7f82cc233a97004ea8ed7ca123a9af07a8230878fcfda9b158bf0"
+checksum = "5b82ac4a3c2ca9c3460964f020e1402edd5753411d7737aa39c3714ad1b5420e"
 dependencies = [
- "fnv",
- "ident_case",
- "proc-macro2",
- "quote",
- "strsim",
- "syn 1.0.109",
+ "crossbeam-utils",
 ]
 
 [[package]]
-name = "darling_macro"
-version = "0.14.4"
+name = "crossbeam-utils"
+version = "0.8.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a4aab4dbc9f7611d8b55048a3a16d2d010c2c8334e46304b40ac1cc14bf3b48e"
-dependencies = [
- "darling_core",
- "quote",
- "syn 1.0.109",
-]
+checksum = "248e3bacc7dc6baa3b21e405ee045c3047101a49145e7e9eca583ab4c2ca5345"
 
 [[package]]
 name = "either"
@@ -407,6 +360,17 @@ dependencies = [
  "pin-utils",
 ]
 
+[[package]]
+name = "getrandom"
+version = "0.2.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "190092ea657667030ac6a35e305e62fc4dd69fd98ac98631e5d3a2b1575a12b5"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
 [[package]]
 name = "gimli"
 version = "0.28.0"
@@ -419,16 +383,6 @@ version = "1.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eabb4a44450da02c90444cf74558da904edde8fb4e9035a9a6a4e15445af0bd7"
 
-[[package]]
-name = "hashbrown"
-version = "0.14.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "290f1a1d9242c78d09ce40a5e87e7554ee637af1351968159f4952f028f75604"
-dependencies = [
- "ahash",
- "allocator-api2",
-]
-
 [[package]]
 name = "hermit-abi"
 version = "0.3.3"
@@ -492,21 +446,6 @@ dependencies = [
  "want",
 ]
 
-[[package]]
-name = "ident_case"
-version = "1.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
-
-[[package]]
-name = "instant"
-version = "0.1.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7a5bbe824c507c5da5956355e86a746d82e0e1464f65d862cc5e71da70e94b2c"
-dependencies = [
- "cfg-if",
-]
-
 [[package]]
 name = "is-macro"
 version = "0.3.0"
@@ -517,7 +456,7 @@ dependencies = [
  "pmutil",
  "proc-macro2",
  "quote",
- "syn 2.0.47",
+ "syn",
 ]
 
 [[package]]
@@ -602,11 +541,13 @@ checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
 name = "lt-core"
 version = "0.1.0"
 dependencies = [
- "cached",
+ "ahash",
  "criterion",
  "is-macro",
  "itertools 0.11.0",
+ "once_cell",
  "serde",
+ "smallvec",
 ]
 
 [[package]]
@@ -700,9 +641,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.18.0"
+version = "1.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
+checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
 
 [[package]]
 name = "oorandom"
@@ -762,7 +703,7 @@ checksum = "4359fd9c9171ec6e8c62926d6faaf553a8dc3f64e1507e76da7911b4f6a04405"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.47",
+ "syn",
 ]
 
 [[package]]
@@ -813,7 +754,7 @@ checksum = "52a40bc70c2c58040d2d8b167ba9a5ff59fc9dab7ad44771cfde3dcfde7a09c6"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.47",
+ "syn",
 ]
 
 [[package]]
@@ -834,6 +775,26 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "rayon"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c27db03db7734835b3f53954b534c91069375ce6ccaa2e065441e07d9b6cdb1"
+dependencies = [
+ "either",
+ "rayon-core",
+]
+
+[[package]]
+name = "rayon-core"
+version = "1.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ce3fb6ad83f861aac485e76e1985cd109d9a3713802152be56c3b1f0e0658ed"
+dependencies = [
+ "crossbeam-deque",
+ "crossbeam-utils",
+]
+
 [[package]]
 name = "redox_syscall"
 version = "0.4.1"
@@ -935,7 +896,7 @@ checksum = "a3385e45322e8f9931410f01b3031ec534c3947d0e94c18049af4d9f9907d4e0"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.47",
+ "syn",
 ]
 
 [[package]]
@@ -991,9 +952,9 @@ dependencies = [
 
 [[package]]
 name = "smallvec"
-version = "1.11.1"
+version = "1.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "942b4a808e05215192e39f4ab80813e599068285906cc91aa64f923db842bd5a"
+checksum = "2593d31f82ead8df961d8bd23a64c2ccf2eb5dd34b0a34bfb4dd54011c72009e"
 
 [[package]]
 name = "socket2"
@@ -1015,23 +976,6 @@ dependencies = [
  "windows-sys",
 ]
 
-[[package]]
-name = "strsim"
-version = "0.10.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ccbca6f34534eb78dbee83f6b2c9442fea7113f43d9e80ea320f0972ae5dc08d"
-
-[[package]]
-name = "syn"
-version = "1.0.109"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
-dependencies = [
- "proc-macro2",
- "quote",
- "unicode-ident",
-]
-
 [[package]]
 name = "syn"
 version = "2.0.47"
@@ -1049,26 +993,6 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2047c6ded9c721764247e62cd3b03c09ffc529b2ba5b10ec482ae507a4a70160"
 
-[[package]]
-name = "thiserror"
-version = "1.0.56"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d54378c645627613241d077a3a79db965db602882668f9136ac42af9ecb730ad"
-dependencies = [
- "thiserror-impl",
-]
-
-[[package]]
-name = "thiserror-impl"
-version = "1.0.56"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fa0faa943b50f3db30a20aa7e265dbc66076993efed8463e8de414e5d06d3471"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.47",
-]
-
 [[package]]
 name = "thread_local"
 version = "1.1.7"
@@ -1116,7 +1040,7 @@ checksum = "630bdcf245f78637c13ec01ffae6187cca34625e8c63150d424b59e55af2675e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.47",
+ "syn",
 ]
 
 [[package]]
@@ -1167,7 +1091,7 @@ checksum = "34704c8d6ebcbc939824180af020566b01a7c01f80641264eba0999f6c2b6be7"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.47",
+ "syn",
 ]
 
 [[package]]
@@ -1275,7 +1199,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn 2.0.47",
+ "syn",
  "wasm-bindgen-shared",
 ]
 
@@ -1297,7 +1221,7 @@ checksum = "54681b18a46765f095758388f2d0cf16eb8d4169b639ab575a8f5693af210c7b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.47",
+ "syn",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -1432,5 +1356,5 @@ checksum = "9ce1b18ccd8e73a9321186f97e46f9f04b778851177567b1975109d26a08d2a6"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.47",
+ "syn",
 ]
diff --git a/lt-core/Cargo.toml b/lt-core/Cargo.toml
index 26dd32c62..38a658447 100644
--- a/lt-core/Cargo.toml
+++ b/lt-core/Cargo.toml
@@ -4,13 +4,15 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
-cached = "0.47.0"
+ahash = "0.8.7"
 is-macro = "0.3.0"
 itertools = "0.11.0"
+once_cell = "1.19.0"
 serde = { version = "1.0.190", features = ["derive"] }
+smallvec = "1.12.0"
 
 [dev-dependencies]
-criterion = { version = "0.5.1", features = ["html_reports", "plotters", "cargo_bench_support"], default_features = false }
+criterion = { version = "0.5.1" }
 
 [[bench]]
 name = "spellcheck"
diff --git a/lt-core/benches/spellcheck.rs b/lt-core/benches/spellcheck.rs
index 1705893a1..efa6165f5 100644
--- a/lt-core/benches/spellcheck.rs
+++ b/lt-core/benches/spellcheck.rs
@@ -7,10 +7,10 @@ fn spellcheck(dictionary: &Dictionary) {
 
 fn criterion_benchmark(c: &mut Criterion) {
     let mut group = c.benchmark_group("spellcheck");
-    group.sample_size(10000);
 
     let dictionary = Dictionary::new();
 
+    group.bench_function("dict create", |b| b.iter(Dictionary::new));
     group.bench_function("hello 5", |b| b.iter(|| spellcheck(&dictionary)));
 }
 
diff --git a/lt-core/src/linting/lint.rs b/lt-core/src/linting/lint.rs
index c90eb062b..3df4b96d7 100644
--- a/lt-core/src/linting/lint.rs
+++ b/lt-core/src/linting/lint.rs
@@ -1,6 +1,6 @@
 use serde::{Deserialize, Serialize};
 
-use crate::{document::Document, span::Span};
+use crate::{document::Document, span::Span, Dictionary};
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct Lint {
@@ -23,4 +23,4 @@ pub enum Suggestion {
     ReplaceWith(Vec<char>),
 }
 
-pub type Linter = fn(document: &Document) -> Vec<Lint>;
+pub type Linter = fn(document: &Document, dictionary: &Dictionary) -> Vec<Lint>;
diff --git a/lt-core/src/linting/mod.rs b/lt-core/src/linting/mod.rs
index 268dd59f3..70147b38f 100644
--- a/lt-core/src/linting/mod.rs
+++ b/lt-core/src/linting/mod.rs
@@ -6,11 +6,11 @@ mod wrong_quotes;
 
 pub use lint::{Lint, LintKind, Suggestion};
 
-use crate::Document;
+use crate::{Dictionary, Document};
 
 use self::lint::Linter;
 
-pub fn all_linters(document: &Document) -> Vec<Lint> {
+pub fn all_linters(document: &Document, dictionary: &Dictionary) -> Vec<Lint> {
     let mut lints = Vec::new();
 
     let linters: [Linter; 4] = [
@@ -21,7 +21,7 @@ pub fn all_linters(document: &Document) -> Vec<Lint> {
     ];
 
     for linter in linters {
-        lints.append(&mut linter(document));
+        lints.append(&mut linter(document, dictionary));
     }
 
     lints
diff --git a/lt-core/src/linting/sentence_capitalization.rs b/lt-core/src/linting/sentence_capitalization.rs
index 8479c12b1..b521759af 100644
--- a/lt-core/src/linting/sentence_capitalization.rs
+++ b/lt-core/src/linting/sentence_capitalization.rs
@@ -1,11 +1,11 @@
 use itertools::Itertools;
 
-use crate::{document::Document, parsing::TokenStringExt, Lint, LintKind};
+use crate::{document::Document, parsing::TokenStringExt, Dictionary, Lint, LintKind};
 
 use super::lint::Suggestion;
 
 /// A linter that checks to make sure the first word of each sentence is capitalized.
-pub fn sentence_capitalization_lint(document: &Document) -> Vec<Lint> {
+pub fn sentence_capitalization_lint(document: &Document, _dictionary: &Dictionary) -> Vec<Lint> {
     let mut lints = Vec::new();
 
     for sentence in document.sentences() {
diff --git a/lt-core/src/linting/spell_check.rs b/lt-core/src/linting/spell_check.rs
index 173f46b35..b028d4878 100644
--- a/lt-core/src/linting/spell_check.rs
+++ b/lt-core/src/linting/spell_check.rs
@@ -2,7 +2,7 @@ use crate::{document::Document, suggest_correct_spelling, Dictionary, Lint, Lint
 
 use super::lint::Suggestion;
 
-pub fn spell_check(document: &Document) -> Vec<Lint> {
+pub fn spell_check(document: &Document, _dictionary: &Dictionary) -> Vec<Lint> {
     let mut lints = Vec::new();
 
     let dictionary = Dictionary::new();
diff --git a/lt-core/src/linting/unclosed_quotes.rs b/lt-core/src/linting/unclosed_quotes.rs
index 3276c9132..9bffe7c7b 100644
--- a/lt-core/src/linting/unclosed_quotes.rs
+++ b/lt-core/src/linting/unclosed_quotes.rs
@@ -1,6 +1,8 @@
-use crate::{document::Document, parsing::Quote, Lint, LintKind, Punctuation, TokenKind};
+use crate::{
+    document::Document, parsing::Quote, Dictionary, Lint, LintKind, Punctuation, TokenKind,
+};
 
-pub fn unclosed_quotes(document: &Document) -> Vec<Lint> {
+pub fn unclosed_quotes(document: &Document, _dictionary: &Dictionary) -> Vec<Lint> {
     let mut lints = Vec::new();
 
     // TODO: Try zipping quote positions
diff --git a/lt-core/src/linting/wrong_quotes.rs b/lt-core/src/linting/wrong_quotes.rs
index 80bb9027e..8a29174bd 100644
--- a/lt-core/src/linting/wrong_quotes.rs
+++ b/lt-core/src/linting/wrong_quotes.rs
@@ -1,8 +1,9 @@
 use crate::{
-    document::Document, parsing::Quote, Lint, LintKind, Punctuation, Suggestion, Token, TokenKind,
+    document::Document, parsing::Quote, Dictionary, Lint, LintKind, Punctuation, Suggestion, Token,
+    TokenKind,
 };
 
-pub fn wrong_quotes(document: &Document) -> Vec<Lint> {
+pub fn wrong_quotes(document: &Document, _dictionary: &Dictionary) -> Vec<Lint> {
     document
         .iter_quote_indices()
         .zip(document.iter_quotes())
diff --git a/lt-core/src/spell/dictionary.rs b/lt-core/src/spell/dictionary.rs
index 8db100edd..f59c5e328 100644
--- a/lt-core/src/spell/dictionary.rs
+++ b/lt-core/src/spell/dictionary.rs
@@ -1,6 +1,10 @@
-use std::{collections::HashSet, iter};
+use std::{borrow::Borrow, hash::Hasher};
 
-use cached::proc_macro::cached;
+use ahash::{AHashSet, AHasher};
+use once_cell::sync::Lazy;
+use smallvec::SmallVec;
+
+type DictWord = SmallVec<[char; 16]>;
 
 #[derive(Debug, Clone)]
 pub struct Dictionary {
@@ -10,19 +14,18 @@ pub struct Dictionary {
     /// This is likely due to increased locality :shrug:.
     ///
     /// This list is sorted by word length (i.e. the shortest words are first).
-    words: Vec<Vec<char>>,
+    words: Vec<DictWord>,
     /// A lookup list for each word length.
-    /// Each index of this list will return the first index of [`Self::words`] that has a word of
-    /// that length.
+    /// Each index of this list will return the first index of [`Self::words`] that has a word
+    /// whose index is that length.
     word_len_starts: Vec<usize>,
-    word_set: HashSet<Vec<char>>,
+    word_set: AHashSet<u64>,
 }
 
-#[cached]
-fn cached_inner_new() -> Dictionary {
+fn uncached_inner_new() -> Dictionary {
     let english_words_raw = include_str!("../../../english_words.txt").replace('\r', "");
 
-    let mut words: Vec<Vec<char>> = english_words_raw
+    let mut words: Vec<DictWord> = english_words_raw
         .split('\n')
         .filter(|word| !word.is_empty())
         .map(|word| word.chars().collect())
@@ -32,28 +35,38 @@ fn cached_inner_new() -> Dictionary {
 
     let mut word_len_starts = vec![0, 0];
 
-    for (index, len) in words.iter().map(Vec::len).enumerate() {
+    for (index, len) in words.iter().map(SmallVec::len).enumerate() {
         if word_len_starts.len() == len {
             word_len_starts.push(index);
         }
     }
 
     Dictionary {
-        word_set: HashSet::from_iter(words.iter().cloned()),
+        word_set: AHashSet::from_iter(words.iter().map(|v| hash_word(v.as_slice()))),
         word_len_starts,
         words,
     }
 }
 
+fn hash_word(word: &[char]) -> u64 {
+    let mut hasher = AHasher::default();
+    for c in word {
+        hasher.write_u32(*c as u32);
+    }
+    hasher.finish()
+}
+
+static DICT: Lazy<Dictionary> = Lazy::new(uncached_inner_new);
+
 impl Dictionary {
-    pub fn new() -> Self {
-        cached_inner_new()
+    pub fn new() -> &'static Self {
+        &DICT
     }
 
     /// Iterate over all the words in the dicitonary of a given length
     pub fn words_with_len_iter(&self, len: usize) -> Box<dyn Iterator<Item = &'_ [char]> + '_> {
         if len == 0 || len >= self.word_len_starts.len() {
-            return Box::new(iter::empty());
+            return Box::new(std::iter::empty());
         }
 
         let start = self.word_len_starts[len];
@@ -73,12 +86,6 @@ impl Dictionary {
     pub fn contains_word(&self, word: &[char]) -> bool {
         let lowercase: Vec<_> = word.iter().flat_map(|c| c.to_lowercase()).collect();
 
-        self.word_set.contains(word) || self.word_set.contains(&lowercase)
-    }
-}
-
-impl Default for Dictionary {
-    fn default() -> Self {
-        Self::new()
+        self.word_set.contains(&hash_word(word)) || self.word_set.contains(&hash_word(&lowercase))
     }
 }
diff --git a/lt-serve/src/main.rs b/lt-serve/src/main.rs
index 019386149..653f32dca 100644
--- a/lt-serve/src/main.rs
+++ b/lt-serve/src/main.rs
@@ -1,6 +1,6 @@
 #![allow(dead_code)]
 
-use lt_core::{all_linters, Document, FatToken, Lint, Span, Suggestion};
+use lt_core::{all_linters, Dictionary, Document, FatToken, Lint, Span, Suggestion};
 use std::net::SocketAddr;
 use tokio::time::Instant;
 use tracing::{debug, info, Level};
@@ -88,9 +88,10 @@ struct ParseResponse {
 async fn lint(Json(payload): Json<LintRequest>) -> (StatusCode, Json<LintResponse>) {
     let text = payload.text;
 
+    let dictionary = Dictionary::new();
     let document = Document::new(&text);
 
-    let lints = all_linters(&document);
+    let lints = all_linters(&document, dictionary);
 
     (StatusCode::ACCEPTED, Json(LintResponse { lints }))
 }