diff --git a/backend/src/api/common.ts b/backend/src/api/common.ts
index 751bab5a3..4cd2b0873 100644
--- a/backend/src/api/common.ts
+++ b/backend/src/api/common.ts
@@ -222,7 +222,25 @@ export class Common {
   }
 
   static getTransactionFlags(tx: TransactionExtended): number {
-    let flags = 0n;
+    let flags = tx.flags ? BigInt(tx.flags) : 0n;
+
+    // Update variable flags (CPFP, RBF)
+    if (tx.ancestors?.length) {
+      flags |= TransactionFlags.cpfp_child;
+    }
+    if (tx.descendants?.length) {
+      flags |= TransactionFlags.cpfp_parent;
+    }
+    if (rbfCache.getRbfTree(tx.txid)) {
+      flags |= TransactionFlags.replacement;
+    }
+
+    // Already processed static flags, no need to do it again
+    if (tx.flags) {
+      return Number(flags);
+    }
+
+    // Process static flags
     if (tx.version === 1) {
       flags |= TransactionFlags.v1;
     } else if (tx.version === 2) {
@@ -306,15 +324,7 @@ export class Common {
     if (hasFakePubkey) {
       flags |= TransactionFlags.fake_pubkey;
     }
-    if (tx.ancestors?.length) {
-      flags |= TransactionFlags.cpfp_child;
-    }
-    if (tx.descendants?.length) {
-      flags |= TransactionFlags.cpfp_parent;
-    }
-    if (rbfCache.getRbfTree(tx.txid)) {
-      flags |= TransactionFlags.replacement;
-    }
+    
     // fast but bad heuristic to detect possible coinjoins
     // (at least 5 inputs and 5 outputs, less than half of which are unique amounts, with no address reuse)
     const addressReuse = Object.values(reusedAddresses).reduce((acc, count) => Math.max(acc, count), 0) > 1;
@@ -335,6 +345,7 @@ export class Common {
 
   static classifyTransaction(tx: TransactionExtended): TransactionClassified {
     const flags = this.getTransactionFlags(tx);
+    tx.flags = flags;
     return {
       ...this.stripTransaction(tx),
       flags,
diff --git a/backend/src/mempool.interfaces.ts b/backend/src/mempool.interfaces.ts
index 4a630f1e4..d5dfcbf14 100644
--- a/backend/src/mempool.interfaces.ts
+++ b/backend/src/mempool.interfaces.ts
@@ -95,6 +95,7 @@ export interface TransactionExtended extends IEsploraApi.Transaction {
   };
   acceleration?: boolean;
   uid?: number;
+  flags?: number;
 }
 
 export interface MempoolTransactionExtended extends TransactionExtended {