diff --git a/crates/bench/Cargo.toml b/crates/bench/Cargo.toml
index b86b3d7af..90d51f97b 100644
--- a/crates/bench/Cargo.toml
+++ b/crates/bench/Cargo.toml
@@ -46,3 +46,4 @@ sha2 = { workspace = true }
 metrohash = "1.0.6"
 cityhash = "0.1.1"
 xxhash-rust = { version = "0.8.8", features = ["xxh3"] }
+blake3 = { version = "1.5.0", features = ["rayon", "mmap"] }
diff --git a/crates/bench/benches/checksum.rs b/crates/bench/benches/checksum.rs
index e648a76db..2e6e81582 100644
--- a/crates/bench/benches/checksum.rs
+++ b/crates/bench/benches/checksum.rs
@@ -185,6 +185,39 @@ fn cityhash128_wheel(c: &mut Criterion<WallTime>) {
     group.finish();
 }
 
+fn blake3_wheel(c: &mut Criterion<WallTime>) {
+    let mut group = c.benchmark_group("blake3_wheel");
+
+    for filename in FILENAMES {
+        group.bench_function(BenchmarkId::from_parameter(filename), |b| {
+            b.iter(|| {
+                let file = fs::read(format!("/Users/crmarsh/workspace/puffin/{filename}")).unwrap();
+                std::hint::black_box(blake3::hash(&file));
+            });
+        });
+    }
+
+    group.finish();
+}
+
+fn blake3_mmap_wheel(c: &mut Criterion<WallTime>) {
+    let mut group = c.benchmark_group("blake3_mmap_wheel");
+
+    for filename in FILENAMES {
+        group.bench_function(BenchmarkId::from_parameter(filename), |b| {
+            b.iter(|| {
+                let mut hasher = blake3::Hasher::new();
+                hasher
+                    .update_mmap_rayon(format!("/Users/crmarsh/workspace/puffin/{filename}"))
+                    .unwrap();
+                std::hint::black_box(hasher.finalize());
+            });
+        });
+    }
+
+    group.finish();
+}
+
 fn crc(c: &mut Criterion<WallTime>) {
     let mut group = c.benchmark_group("crc");
 
@@ -212,13 +245,15 @@ fn crc(c: &mut Criterion<WallTime>) {
 
 criterion_group!(
     checksum,
-    xxhash_wheel,
-    seahash_wheel,
-    metrohash_wheel,
-    cityhash64_wheel,
-    cityhash128_wheel,
-    sha256_wheel,
-    crc32_wheel,
+    blake3_mmap_wheel,
+    blake3_wheel,
+    // xxhash_wheel,
+    // seahash_wheel,
+    // metrohash_wheel,
+    // cityhash64_wheel,
+    // cityhash128_wheel,
+    // sha256_wheel,
+    // crc32_wheel,
     // sha256_record,
     // checksum_record,
     // seahash_record,
diff --git a/crates/puffin-extract/Cargo.toml b/crates/puffin-extract/Cargo.toml
index 51762ad60..d91cb43d2 100644
--- a/crates/puffin-extract/Cargo.toml
+++ b/crates/puffin-extract/Cargo.toml
@@ -26,3 +26,4 @@ seahash.workspace = true
 sha2.workspace = true
 sha = "1.0.3"
 hex.workspace = true
+blake3 = "1.5.0"
diff --git a/crates/puffin-extract/src/lib.rs b/crates/puffin-extract/src/lib.rs
index 1a3572385..855fa9cd1 100644
--- a/crates/puffin-extract/src/lib.rs
+++ b/crates/puffin-extract/src/lib.rs
@@ -1,12 +1,10 @@
-use std::hash::Hasher;
 use std::path::{Path, PathBuf};
 use std::pin::Pin;
 use std::task::{Context, Poll};
 
 use rayon::prelude::*;
-use sha::utils::{Digest, DigestExt};
 use tokio::io::ReadBuf;
-use tokio_util::compat::{FuturesAsyncReadCompatExt, TokioAsyncReadCompatExt};
+use tokio_util::compat::FuturesAsyncReadCompatExt;
 use zip::result::ZipError;
 use zip::ZipArchive;
 
@@ -30,29 +28,24 @@ pub enum Error {
     InvalidArchive(Vec<fs_err::DirEntry>),
 }
 
-struct HashingReader<R, H> {
+struct HashingReader<'a, R> {
     reader: R,
-    hasher: H,
+    hasher: &'a mut blake3::Hasher,
 }
 
-impl<R, H> HashingReader<R, H>
+impl<'a, R> HashingReader<'a, R>
 where
     R: tokio::io::AsyncRead + Unpin,
-    H: std::hash::Hasher + Unpin,
+    // H: std::hash::Hasher + Unpin,
 {
-    fn new(reader: R, hasher: H) -> Self {
+    fn new(reader: R, hasher: &'a mut blake3::Hasher) -> Self {
         HashingReader { reader, hasher }
     }
-
-    fn into_inner(self) -> (R, H) {
-        (self.reader, self.hasher)
-    }
 }
 
-impl<R, H> tokio::io::AsyncRead for HashingReader<R, H>
+impl<'a, R> tokio::io::AsyncRead for HashingReader<'a, R>
 where
     R: tokio::io::AsyncRead + Unpin,
-    H: std::hash::Hasher + Unpin,
 {
     fn poll_read(
         mut self: Pin<&mut Self>,
@@ -62,7 +55,7 @@ where
         let reader = Pin::new(&mut self.reader);
         match reader.poll_read(cx, buf) {
             Poll::Ready(Ok(())) => {
-                self.hasher.write(buf.filled());
+                self.hasher.update_rayon(buf.filled());
                 Poll::Ready(Ok(()))
             }
             other => other,
@@ -79,7 +72,7 @@ pub async fn unzip_no_seek<R: tokio::io::AsyncRead + Unpin>(
     reader: R,
     target: &Path,
 ) -> Result<(), Error> {
-    let mut hasher = seahash::SeaHasher::default();
+    let mut hasher = blake3::Hasher::default();
     let reader = HashingReader::new(reader, &mut hasher);
 
     let mut zip = async_zip::base::read::stream::ZipFileReader::with_tokio(reader);
diff --git a/crates/puffin-installer/src/downloader.rs b/crates/puffin-installer/src/downloader.rs
index 42692092e..1262366c7 100644
--- a/crates/puffin-installer/src/downloader.rs
+++ b/crates/puffin-installer/src/downloader.rs
@@ -1,10 +1,8 @@
 use std::cmp::Reverse;
-use std::hash::Hasher;
 use std::path::{Path, PathBuf};
 use std::sync::Arc;
 
 use futures::{FutureExt, Stream, StreamExt, TryFutureExt, TryStreamExt};
-use sha2::Digest;
 use tokio::task::JoinError;
 use tracing::instrument;
 use url::Url;