diff --git a/crates/primitives/src/transaction/mod.rs b/crates/primitives/src/transaction/mod.rs
index c69d5c026cf7..c71afd5ca857 100644
--- a/crates/primitives/src/transaction/mod.rs
+++ b/crates/primitives/src/transaction/mod.rs
@@ -8,10 +8,10 @@ use alloy_rlp::{
 use bytes::{Buf, BytesMut};
 use derive_more::{AsRef, Deref};
 use once_cell::sync::Lazy;
-use rayon::prelude::*;
+use rayon::prelude::{IntoParallelIterator, ParallelIterator};
 use reth_codecs::{add_arbitrary_tests, derive_arbitrary, Compact};
 use serde::{Deserialize, Serialize};
-use std::{mem, sync::mpsc, thread};
+use std::mem;
 
 pub use access_list::{AccessList, AccessListItem};
 pub use eip1559::TxEip1559;
@@ -833,16 +833,6 @@ impl TransactionSignedNoHash {
         self.signature.recover_signer(signature_hash)
     }
 
-    /// Recover signer helper for parallel impl.
-    ///
-    /// Returns `None` if the transaction's signature is invalid, see also [Self::recover_signer].
-    pub fn recover_signer_helper(&self, rlp_buf: &mut Vec<u8>) -> Option<Address> {
-        let tx = self;
-        tx.transaction.encode_without_signature(rlp_buf);
-
-        tx.signature.recover_signer(keccak256(rlp_buf))
-    }
-
     /// Converts into a transaction type with its hash: [`TransactionSigned`].
     pub fn with_hash(self) -> TransactionSigned {
         self.into()
@@ -862,15 +852,13 @@ impl TransactionSignedNoHash {
             let mut recovered_signers: Vec<Address> = Vec::new();
             let mut channels = Vec::new();
             rayon::scope(|s| {
-                let (chunk_size, chunks) =
-                    if num_txes < (rayon::current_num_threads() * rayon::current_num_threads()) {
-                        (num_txes, 2)
-                    } else {
-                        let chunk_size = num_txes /
-                            (rayon::current_num_threads() * rayon::current_num_threads());
-                        let chunks = num_txes / chunk_size + 1;
-                        (chunk_size, chunks)
-                    };
+                let (chunk_size, chunks) = if num_txes < 16 {
+                    (num_txes, 2)
+                } else {
+                    let chunk_size = num_txes / (num_txes / 16);
+                    let chunks = num_txes / chunk_size + 1;
+                    (chunk_size, chunks)
+                };
                 let mut iter = txes.into_iter();
                 (0..chunks).for_each(|i| {
                     let chunk: Vec<&TransactionSignedNoHash> = if i == chunks - 1 {
@@ -884,10 +872,8 @@ impl TransactionSignedNoHash {
                     // This task will send the results through the channel after it recovered
                     // the senders.
                     s.spawn(move |_| {
-                        let mut rlp_buf = Vec::with_capacity(128);
                         for tx in chunk {
-                            rlp_buf.clear();
-                            let recovery_result = tx.recover_signer_helper(&mut rlp_buf);
+                            let recovery_result = tx.recover_signer();
                             let _ = recovered_senders_tx.send(recovery_result);
                         }
                     });
@@ -1052,16 +1038,6 @@ impl TransactionSigned {
         self.signature.recover_signer(signature_hash)
     }
 
-    /// Recover signer helper for parallel impl.
-    ///
-    /// Returns `None` if the transaction's signature is invalid, see also [Self::recover_signer].
-    pub fn recover_signer_helper(&self, rlp_buf: &mut Vec<u8>) -> Option<Address> {
-        let tx = self;
-        tx.transaction.encode_without_signature(rlp_buf);
-
-        tx.signature.recover_signer(keccak256(rlp_buf))
-    }
-
     /// Recovers a list of signers from a transaction list iterator
     ///
     /// Returns `None`, if some transaction's signature is invalid, see also
@@ -1076,15 +1052,13 @@ impl TransactionSigned {
             let mut recovered_signers: Vec<Address> = Vec::new();
             let mut channels = Vec::new();
             rayon::scope(|s| {
-                let (chunk_size, chunks) =
-                    if num_txes < (rayon::current_num_threads() * rayon::current_num_threads()) {
-                        (num_txes, 2)
-                    } else {
-                        let chunk_size = num_txes /
-                            (rayon::current_num_threads() * rayon::current_num_threads());
-                        let chunks = num_txes / chunk_size + 1;
-                        (chunk_size, chunks)
-                    };
+                let (chunk_size, chunks) = if num_txes < 16 {
+                    (num_txes, 2)
+                } else {
+                    let chunk_size = num_txes / (num_txes / 16);
+                    let chunks = num_txes / chunk_size + 1;
+                    (chunk_size, chunks)
+                };
                 let mut iter = txes.into_iter();
                 (0..chunks).for_each(|i| {
                     let chunk: Vec<&TransactionSigned> = if i == chunks - 1 {
@@ -1098,10 +1072,8 @@ impl TransactionSigned {
                     // This task will send the results through the channel after it recovered
                     // the senders.
                     s.spawn(move |_| {
-                        let mut rlp_buf = Vec::with_capacity(128);
                         for tx in chunk {
-                            rlp_buf.clear();
-                            let recovery_result = tx.recover_signer_helper(&mut rlp_buf);
+                            let recovery_result = tx.recover_signer();
                             let _ = recovered_senders_tx.send(recovery_result);
                         }
                     });
@@ -1363,7 +1335,7 @@ impl TransactionSigned {
     /// To decode EIP-4844 transactions in `eth_sendRawTransaction`, use
     /// [PooledTransactionsElement::decode_enveloped].
     pub fn decode_enveloped(data: &mut &[u8]) -> alloy_rlp::Result<Self> {
-                if data.is_empty() {
+        if data.is_empty() {
             return Err(RlpError::InputTooShort)
         }