perf: disable snapshot compression (#18061)

This commit disables snapshot compression for the CLI snapshot.]

Decompressing the snapshot on startup takes ~2.5ms.

1 files changed, 2 insertions, 31 deletions

diff --git a/runtime/js.rs b/runtime/js.rs
index 57b1e7be4..3101e4b6b 100644
--- a/runtime/js.rs
+++ b/runtime/js.rs
@@ -1,43 +1,14 @@
 // Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
 #[cfg(not(feature = "dont_create_runtime_snapshot"))]
 use deno_core::Snapshot;
-#[cfg(not(feature = "dont_create_runtime_snapshot"))]
-use log::debug;
-#[cfg(not(feature = "dont_create_runtime_snapshot"))]
-use once_cell::sync::Lazy;
 
 #[cfg(not(feature = "dont_create_runtime_snapshot"))]
-static COMPRESSED_RUNTIME_SNAPSHOT: &[u8] =
+static RUNTIME_SNAPSHOT: &[u8] =
   include_bytes!(concat!(env!("OUT_DIR"), "/RUNTIME_SNAPSHOT.bin"));
 
 #[cfg(not(feature = "dont_create_runtime_snapshot"))]
-pub static RUNTIME_SNAPSHOT: Lazy<Box<[u8]>> = Lazy::new(
-  #[allow(clippy::uninit_vec)]
-  #[cold]
-  #[inline(never)]
-  || {
-    let size =
-      u32::from_le_bytes(COMPRESSED_RUNTIME_SNAPSHOT[0..4].try_into().unwrap())
-        as usize;
-    let mut vec = Vec::with_capacity(size);
-
-    // SAFETY: vec is allocated with exact snapshot size (+ alignment)
-    // SAFETY: non zeroed bytes are overwritten with decompressed snapshot
-    unsafe {
-      vec.set_len(size);
-    }
-
-    lzzzz::lz4::decompress(&COMPRESSED_RUNTIME_SNAPSHOT[4..], &mut vec)
-      .unwrap();
-
-    vec.into_boxed_slice()
-  },
-);
-
-#[cfg(not(feature = "dont_create_runtime_snapshot"))]
 pub fn deno_isolate_init() -> Snapshot {
-  debug!("Deno isolate init with snapshots.");
-  Snapshot::Static(&RUNTIME_SNAPSHOT)
+  Snapshot::Static(RUNTIME_SNAPSHOT)
 }
 
 #[cfg(not(feature = "include_js_files_for_snapshotting"))]