perf(l1, l2): use fxhash for diff layers

Cargo.toml

@@ -99,6 +99,7 @@ tokio-util = { version = "0.7.15", features = ["rt"] }
 jsonwebtoken = "9.3.0"
 rand = "0.8.5"
 reqwest = { version = "0.12.7", features = ["socks", "json"] }
+rustc-hash = "2.1.1"
 snap = "1.1.1"
 secp256k1 = { version = "0.30.0", default-features = false, features = [
   "global-context",

crates/storage/Cargo.toml

@@ -23,6 +23,7 @@ hex.workspace = true
 serde = { version = "1.0.203", features = ["derive"] }
 serde_json = "1.0.117"
 rocksdb = { workspace = true, optional = true }
+rustc-hash.workspace = true
 tokio = { workspace = true, optional = true, features = ["rt"] }
 bincode = "1.3.3"
 

crates/storage/trie_db/layering.rs

@@ -1,12 +1,13 @@
 use ethrex_common::H256;
 use ethrex_rlp::decode::RLPDecode;
-use std::{collections::HashMap, sync::Arc, sync::RwLock};
+use rustc_hash::FxHashMap;
+use std::{sync::Arc, sync::RwLock};
 
 use ethrex_trie::{EMPTY_TRIE_HASH, Nibbles, Node, TrieDB, TrieError};
 
 #[derive(Debug)]
 struct TrieLayer {
-    nodes: HashMap<Vec<u8>, Vec<u8>>,
+    nodes: FxHashMap<Vec<u8>, Vec<u8>>,
     parent: H256,
     id: usize,
 }
@@ -16,7 +17,7 @@ pub struct TrieLayerCache {
     /// Monotonically increasing ID for layers, starting at 1.
     /// TODO: this implementation panics on overflow
     last_id: usize,
-    layers: HashMap<H256, TrieLayer>,
+    layers: FxHashMap<H256, TrieLayer>,
 }
 
 impl TrieLayerCache {
@@ -74,7 +75,7 @@ impl TrieLayerCache {
             .or_insert_with(|| {
                 self.last_id += 1;
                 TrieLayer {
-                    nodes: HashMap::new(),
+                    nodes: FxHashMap::default(),
                     parent,
                     id: self.last_id,
                 }