diff --git a/Cargo.toml b/Cargo.toml
index e3c3e5a..314dbeb 100755
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "pywordfreq"
-version = "0.3.0"
+version = "0.3.1"
 authors = ["Gal Ben David <gal@intsights.com>"]
 edition = "2021"
 description = "Word frequency checker based on Wikipedia corpus written in Rust"
@@ -36,12 +36,13 @@ crate-type = ["cdylib"]
 
 [dependencies]
 ahash = "0.7"
-suffix = "1.2"
-once_cell = "1.8"
 flate2 = { version = "1", features = ["zlib-ng-compat"], default-features = false }
+memchr = "2.4"
+once_cell = "1.9"
+suffix = "1.2"
 
 [dependencies.pyo3]
-version = "0.15.0"
+version = "0.15.1"
 features = ["extension-module"]
 
 [profile.release]
diff --git a/pyproject.toml b/pyproject.toml
index 63be7dc..88fa504 100755
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,11 +9,10 @@ sdist-include = [
     "pywordfreq/*.py",
     "pywordfreq/*.pyi"
 ]
-# strip = true
 
 [tool.poetry]
 name = "pywordfreq"
-version = "0.3.0"
+version = "0.3.1"
 authors = ["Gal Ben David <gal@intsights.com>"]
 description = "Word frequency checker based on Wikipedia corpus written in Rust"
 readme = "README.md"
diff --git a/pywordfreq/__init__.py b/pywordfreq/__init__.py
index f2807a4..6e0668f 100755
--- a/pywordfreq/__init__.py
+++ b/pywordfreq/__init__.py
@@ -23,7 +23,7 @@ def lazy_full_frequency(
 
 
 def lazy_partial_frequency(
-    word,
+    pattern,
 ):
     pywordfreq.load_dictionary(
         importlib.resources.read_binary(
@@ -38,7 +38,7 @@ def lazy_partial_frequency(
     full_frequency = pywordfreq.full_frequency
     partial_frequency = pywordfreq.partial_frequency
 
-    return pywordfreq.partial_frequency(word)
+    return pywordfreq.partial_frequency(pattern)
 
 
 full_frequency = lazy_full_frequency
diff --git a/src/lib.rs b/src/lib.rs
index 2e1d2ef..f1c029d 100755
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,7 @@
 use ahash::{AHashMap, AHashSet};
 use flate2::read::GzDecoder;
-use once_cell::sync::Lazy;
+use memchr::memmem;
+use once_cell::sync::{Lazy, OnceCell};
 use pyo3::prelude::*;
 use pyo3::types::PyUnicode;
 use std::io::prelude::*;
@@ -27,10 +28,13 @@ static mut FOUND_WORDS_START_INDEX: Lazy<AHashSet<usize>> = Lazy::new(
         AHashSet::with_capacity(1000)
     }
 );
+static NL_RFINDER: OnceCell<memmem::FinderRev> = OnceCell::new();
 
 
 #[pymodule]
 fn pywordfreq(_py: Python, m: &PyModule) -> PyResult<()> {
+    NL_RFINDER.set(memmem::FinderRev::new(b"\n")).unwrap();
+
     #[pyfn(m)]
     fn load_dictionary(
         dictionary_compressed: &[u8],
@@ -96,7 +100,7 @@ fn pywordfreq(_py: Python, m: &PyModule) -> PyResult<()> {
             let suffix_table_text = SUFFIX_TABLE.text();
 
             for suffix_index in SUFFIX_TABLE.positions(word_lowered.as_str()) {
-                let start_index: usize = match suffix_table_text.get_unchecked(..*suffix_index as usize).rfind('\n') {
+                let start_index: usize = match NL_RFINDER.get_unchecked().rfind(suffix_table_text.get_unchecked(..*suffix_index as usize)) {
                     Some(start_index) => start_index + 1,
                     None => 0,
                 };