diff --git a/src/blocks/tipset.rs b/src/blocks/tipset.rs
index b01964dfdfc0..efb685ace365 100644
--- a/src/blocks/tipset.rs
+++ b/src/blocks/tipset.rs
@@ -241,7 +241,7 @@ impl Tipset {
     pub fn new<H: Into<CachingBlockHeader>>(
         headers: impl IntoIterator<Item = H>,
     ) -> Result<Self, CreateTipsetError> {
-        let headers = NonEmpty::new(
+        let mut headers = NonEmpty::new(
             headers
                 .into_iter()
                 .map(Into::<CachingBlockHeader>::into)
@@ -249,7 +249,7 @@ impl Tipset {
                 .collect(),
         )
         .map_err(|_| CreateTipsetError::Empty)?;
-
+        headers.shrink_to_fit();
         verify_block_headers(&headers)?;
 
         Ok(Self {
diff --git a/src/chain/store/chain_store.rs b/src/chain/store/chain_store.rs
index 34b7636ce3d5..381d65128621 100644
--- a/src/chain/store/chain_store.rs
+++ b/src/chain/store/chain_store.rs
@@ -583,7 +583,8 @@ impl MsgsInTipsetCache {
         }
     }
 
-    pub fn insert(&self, key: TipsetKey, value: Vec<ChainMessage>) {
+    pub fn insert(&self, key: TipsetKey, mut value: Vec<ChainMessage>) {
+        value.shrink_to_fit();
         self.cache.push(key, value);
     }
 
diff --git a/src/state_manager/cache.rs b/src/state_manager/cache.rs
index 9c1a7c1609d3..83dd2f89ba27 100644
--- a/src/state_manager/cache.rs
+++ b/src/state_manager/cache.rs
@@ -203,14 +203,17 @@ impl EnabledTipsetDataCache {
 }
 
 impl TipsetReceiptEventCacheHandler for EnabledTipsetDataCache {
-    fn insert_receipt(&self, key: &TipsetKey, receipts: Vec<Receipt>) {
+    fn insert_receipt(&self, key: &TipsetKey, mut receipts: Vec<Receipt>) {
         if !receipts.is_empty() {
+            receipts.shrink_to_fit();
             self.receipt_cache.insert(key.clone(), receipts);
         }
     }
 
-    fn insert_events(&self, key: &TipsetKey, events_data: StateEvents) {
+    fn insert_events(&self, key: &TipsetKey, mut events_data: StateEvents) {
         if !events_data.events.is_empty() {
+            events_data.events.shrink_to_fit();
+            events_data.roots.shrink_to_fit();
             self.events_cache.insert(key.clone(), events_data);
         }
     }