diff --git a/bench-tps/src/bench.rs b/bench-tps/src/bench.rs
index fe7c4f7915..16e32a1215 100644
--- a/bench-tps/src/bench.rs
+++ b/bench-tps/src/bench.rs
@@ -110,7 +110,7 @@ fn generate_chunked_transfers(
     shared_txs: &SharedTransactions,
     shared_tx_active_thread_count: Arc<AtomicIsize>,
     source_keypair_chunks: Vec<Vec<&Keypair>>,
-    dest_keypair_chunks: &mut Vec<VecDeque<&Keypair>>,
+    dest_keypair_chunks: &mut [VecDeque<&Keypair>],
     threads: usize,
     duration: Duration,
     sustained: bool,
diff --git a/core/src/heaviest_subtree_fork_choice.rs b/core/src/heaviest_subtree_fork_choice.rs
index 66ecc3c2c6..1a360ee844 100644
--- a/core/src/heaviest_subtree_fork_choice.rs
+++ b/core/src/heaviest_subtree_fork_choice.rs
@@ -2715,7 +2715,8 @@ mod test {
                 stake
             );
         }
-        for slot in &[17] {
+        {
+            let slot = &17;
             assert_eq!(
                 tree1
                     .stake_voted_subtree(&(*slot, Hash::default()))
diff --git a/core/src/repair_weight.rs b/core/src/repair_weight.rs
index ae535804fb..b45c235d3f 100644
--- a/core/src/repair_weight.rs
+++ b/core/src/repair_weight.rs
@@ -642,7 +642,7 @@ impl RepairWeight {
     }
 
     // Heavier, smaller slots come first
-    fn sort_by_stake_weight_slot(slot_stake_voted: &mut Vec<(Slot, u64)>) {
+    fn sort_by_stake_weight_slot(slot_stake_voted: &mut [(Slot, u64)]) {
         slot_stake_voted.sort_by(|(slot, stake_voted), (slot_, stake_voted_)| {
             if stake_voted == stake_voted_ {
                 slot.cmp(slot_)
diff --git a/perf/src/sigverify.rs b/perf/src/sigverify.rs
index e11c9409c0..1ba75823da 100644
--- a/perf/src/sigverify.rs
+++ b/perf/src/sigverify.rs
@@ -507,7 +507,7 @@ impl Deduper {
 }
 
 //inplace shrink a batch of packets
-pub fn shrink_batches(batches: &mut Vec<PacketBatch>) -> usize {
+pub fn shrink_batches(batches: &mut [PacketBatch]) -> usize {
     let mut valid_batch_ix = 0;
     let mut valid_packet_ix = 0;
     let mut last_valid_batch = 0;
@@ -570,7 +570,7 @@ pub fn ed25519_verify_disabled(batches: &mut [PacketBatch]) {
     inc_new_counter_debug!("ed25519_verify_disabled", packet_count);
 }
 
-pub fn copy_return_values(sig_lens: &[Vec<u32>], out: &PinnedVec<u8>, rvs: &mut Vec<Vec<u8>>) {
+pub fn copy_return_values(sig_lens: &[Vec<u32>], out: &PinnedVec<u8>, rvs: &mut [Vec<u8>]) {
     let mut num = 0;
     for (vs, sig_vs) in rvs.iter_mut().zip(sig_lens.iter()) {
         for (v, sig_v) in vs.iter_mut().zip(sig_vs.iter()) {
@@ -1531,9 +1531,9 @@ mod tests {
 
         // No batches
         // truncate of 1 on len 0 is a noop
-        assert_eq!(shrink_batches(&mut vec![]), 0);
+        assert_eq!(shrink_batches(&mut []), 0);
         // One empty batch
-        assert_eq!(shrink_batches(&mut vec![PacketBatch::with_capacity(0)]), 0);
+        assert_eq!(shrink_batches(&mut [PacketBatch::with_capacity(0)]), 0);
         // Many empty batches
         let mut batches = (0..BATCH_COUNT)
             .map(|_| PacketBatch::with_capacity(0))
diff --git a/rpc/src/rpc.rs b/rpc/src/rpc.rs
index 843686bbfe..b29e24c9f5 100644
--- a/rpc/src/rpc.rs
+++ b/rpc/src/rpc.rs
@@ -2075,7 +2075,7 @@ impl JsonRpcRequestProcessor {
     }
 }
 
-fn optimize_filters(filters: &mut Vec<RpcFilterType>) {
+fn optimize_filters(filters: &mut [RpcFilterType]) {
     filters.iter_mut().for_each(|filter_type| {
         if let RpcFilterType::Memcmp(compare) = filter_type {
             use MemcmpEncodedBytes::*;
diff --git a/streamer/src/sendmmsg.rs b/streamer/src/sendmmsg.rs
index 47abcc0af8..b236473b65 100644
--- a/streamer/src/sendmmsg.rs
+++ b/streamer/src/sendmmsg.rs
@@ -84,12 +84,12 @@ fn mmsghdr_for_packet(
 }
 
 #[cfg(target_os = "linux")]
-fn sendmmsg_retry(sock: &UdpSocket, hdrs: &mut Vec<mmsghdr>) -> Result<(), SendPktsError> {
+fn sendmmsg_retry(sock: &UdpSocket, hdrs: &mut [mmsghdr]) -> Result<(), SendPktsError> {
     let sock_fd = sock.as_raw_fd();
     let mut total_sent = 0;
     let mut erropt = None;
 
-    let mut pkts = &mut hdrs[..];
+    let mut pkts = &mut *hdrs;
     while !pkts.is_empty() {
         let npkts = match unsafe { libc::sendmmsg(sock_fd, &mut pkts[0], pkts.len() as u32, 0) } {
             -1 => {