diff --git a/.changelog/unreleased/improvements/3003-use-lru-caches-in-blockstore.md b/.changelog/unreleased/improvements/3003-use-lru-caches-in-blockstore.md
new file mode 100644
index 0000000000..14d4cf2abf
--- /dev/null
+++ b/.changelog/unreleased/improvements/3003-use-lru-caches-in-blockstore.md
@@ -0,0 +1,2 @@
+- [`blockstore`] Use LRU caches in blockstore, significiantly improving consensus gossip routine performance
+  ([\#3003](https://github.com/cometbft/cometbft/issues/3003)
diff --git a/.golangci.yml b/.golangci.yml
index c9a29c4904..455afc5b72 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -64,6 +64,7 @@ linters-settings:
           - github.com/google
           - github.com/gorilla/websocket
           - github.com/informalsystems/tm-load-test/pkg/loadtest
+          - github.com/hashicorp/golang-lru/v2
           - github.com/lib/pq
           - github.com/libp2p/go-buffer-pool
           - github.com/Masterminds/semver/v3
diff --git a/go.mod b/go.mod
index 6ee88bb521..67c15c9cf7 100644
--- a/go.mod
+++ b/go.mod
@@ -52,6 +52,7 @@ require (
 	github.com/cosmos/gogoproto v1.4.2
 	github.com/go-git/go-git/v5 v5.11.0
 	github.com/golang/protobuf v1.5.3
+	github.com/hashicorp/golang-lru/v2 v2.0.7
 	github.com/oasisprotocol/curve25519-voi v0.0.0-20220708102147-0a8a51822cae
 	github.com/vektra/mockery/v2 v2.14.0
 	golang.org/x/sync v0.3.0
diff --git a/go.sum b/go.sum
index a36a9aa1fb..f72ed91cf3 100644
--- a/go.sum
+++ b/go.sum
@@ -494,6 +494,8 @@ github.com/hashicorp/go-version v1.6.0 h1:feTTfFNnjP967rlCxM/I9g701jU+RN74YKx2mO
 github.com/hashicorp/go-version v1.6.0/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09ZGVZPK5anwXA=
 github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
 github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
+github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
+github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
 github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4=
 github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
 github.com/hexops/gotextdiff v1.0.3 h1:gitA9+qJrrTCsiCl7+kh75nPqQt1cx4ZkudSTLoUqJM=
diff --git a/store/bench_test.go b/store/bench_test.go
new file mode 100644
index 0000000000..b6d55bb211
--- /dev/null
+++ b/store/bench_test.go
@@ -0,0 +1,37 @@
+package store
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/cometbft/cometbft/internal/test"
+	"github.com/cometbft/cometbft/libs/log"
+	"github.com/cometbft/cometbft/types"
+	cmttime "github.com/cometbft/cometbft/types/time"
+)
+
+// TestLoadBlockExtendedCommit tests loading the extended commit for a previously
+// saved block. The load method should return nil when only a commit was saved and
+// return the extended commit otherwise.
+func BenchmarkRepeatedLoadSeenCommitSameBlock(b *testing.B) {
+	state, bs, cleanup := makeStateAndBlockStore(log.NewTMLogger(new(bytes.Buffer)))
+	defer cleanup()
+	h := bs.Height() + 1
+	block := state.MakeBlock(h, test.MakeNTxs(h, 10), new(types.Commit), nil, state.Validators.GetProposer().Address)
+	seenCommit := makeTestCommit(block.Header.Height, cmttime.Now())
+	ps, err := block.MakePartSet(types.BlockPartSizeBytes)
+	require.NoError(b, err)
+	bs.SaveBlock(block, ps, seenCommit)
+
+	// sanity check
+	res := bs.LoadSeenCommit(block.Height)
+	require.Equal(b, seenCommit, res)
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		res := bs.LoadSeenCommit(block.Height)
+		require.NotNil(b, res)
+	}
+}
diff --git a/store/store.go b/store/store.go
index 0d7f5a432d..f96891d200 100644
--- a/store/store.go
+++ b/store/store.go
@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"strconv"
 
+	lru "github.com/hashicorp/golang-lru/v2"
+
 	dbm "github.com/cometbft/cometbft-db"
 	"github.com/cosmos/gogoproto/proto"
 
@@ -41,17 +43,35 @@ type BlockStore struct {
 	mtx    cmtsync.RWMutex
 	base   int64
 	height int64
+
+	seenCommitCache  *lru.Cache[int64, *types.Commit]
+	blockCommitCache *lru.Cache[int64, *types.Commit]
 }
 
 // NewBlockStore returns a new BlockStore with the given DB,
 // initialized to the last height that was committed to the DB.
 func NewBlockStore(db dbm.DB) *BlockStore {
 	bs := LoadBlockStoreState(db)
-	return &BlockStore{
+	bStore := &BlockStore{
 		base:   bs.Base,
 		height: bs.Height,
 		db:     db,
 	}
+	bStore.addCaches()
+	return bStore
+}
+
+func (bs *BlockStore) addCaches() {
+	var err error
+	// err can only occur if the argument is non-positive, so is impossible in context.
+	bs.blockCommitCache, err = lru.New[int64, *types.Commit](100)
+	if err != nil {
+		panic(err)
+	}
+	bs.seenCommitCache, err = lru.New[int64, *types.Commit](100)
+	if err != nil {
+		panic(err)
+	}
 }
 
 func (bs *BlockStore) IsEmpty() bool {
@@ -224,6 +244,10 @@ func (bs *BlockStore) LoadBlockMetaByHash(hash []byte) *types.BlockMeta {
 // and it comes from the block.LastCommit for `height+1`.
 // If no commit is found for the given height, it returns nil.
 func (bs *BlockStore) LoadBlockCommit(height int64) *types.Commit {
+	comm, ok := bs.blockCommitCache.Get(height)
+	if ok {
+		return comm.Clone()
+	}
 	pbc := new(cmtproto.Commit)
 	bz, err := bs.db.Get(calcBlockCommitKey(height))
 	if err != nil {
@@ -240,13 +264,18 @@ func (bs *BlockStore) LoadBlockCommit(height int64) *types.Commit {
 	if err != nil {
 		panic(fmt.Sprintf("Error reading block commit: %v", err))
 	}
-	return commit
+	bs.blockCommitCache.Add(height, commit)
+	return commit.Clone()
 }
 
 // LoadSeenCommit returns the locally seen Commit for the given height.
 // This is useful when we've seen a commit, but there has not yet been
 // a new block at `height + 1` that includes this commit in its block.LastCommit.
 func (bs *BlockStore) LoadSeenCommit(height int64) *types.Commit {
+	comm, ok := bs.seenCommitCache.Get(height)
+	if ok {
+		return comm.Clone()
+	}
 	pbc := new(cmtproto.Commit)
 	bz, err := bs.db.Get(calcSeenCommitKey(height))
 	if err != nil {
@@ -264,7 +293,8 @@ func (bs *BlockStore) LoadSeenCommit(height int64) *types.Commit {
 	if err != nil {
 		panic(fmt.Errorf("error from proto commit: %w", err))
 	}
-	return commit
+	bs.seenCommitCache.Add(height, commit)
+	return commit.Clone()
 }
 
 // PruneBlocks removes block up to (but not including) a height. It returns number of blocks pruned.
diff --git a/types/block.go b/types/block.go
index 52ac292cc9..92461fbc88 100644
--- a/types/block.go
+++ b/types/block.go
@@ -801,6 +801,15 @@ func (commit *Commit) GetVote(valIdx int32) *Vote {
 	}
 }
 
+// Clone creates a deep copy of this commit.
+func (commit *Commit) Clone() *Commit {
+	sigs := make([]CommitSig, len(commit.Signatures))
+	copy(sigs, commit.Signatures)
+	commCopy := *commit
+	commCopy.Signatures = sigs
+	return &commCopy
+}
+
 // VoteSignBytes returns the bytes of the Vote corresponding to valIdx for
 // signing.
 //