diff --git a/src/MoneroEngine.ts b/src/MoneroEngine.ts
index 6027316..ca835e9 100644
--- a/src/MoneroEngine.ts
+++ b/src/MoneroEngine.ts
@@ -66,6 +66,9 @@ const SAVE_DATASTORE_MILLISECONDS = 10000
 
 const PRIMARY_CURRENCY_TOKEN_ID = null
 
+// Global throttle: max 1 onAddressesChecked per 500ms; ratio=1 always passes.
+let lastSyncEmitTime = 0
+
 export class MoneroEngine implements EdgeCurrencyEngine {
   apiKey: string
   walletInfo: SafeWalletInfo
@@ -169,6 +172,9 @@ export class MoneroEngine implements EdgeCurrencyEngine {
       return
     }
     if (numTx !== totalTxs) {
+      const now = Date.now()
+      if (now - lastSyncEmitTime < 500) return
+      lastSyncEmitTime = now
       const progress = numTx / totalTxs
       this.edgeTxLibCallbacks.onAddressesChecked(progress)
     } else {
@@ -304,8 +310,10 @@ export class MoneroEngine implements EdgeCurrencyEngine {
     }
 
     this.saveTransactionState(PRIMARY_CURRENCY_TOKEN_ID, edgeTransaction)
-    this.edgeTxLibCallbacks.onTransactions(this.transactionEventArray)
-    this.transactionEventArray = []
+    if (this.transactionEventArray.length > 0) {
+      this.edgeTxLibCallbacks.onTransactions(this.transactionEventArray)
+      this.transactionEventArray = []
+    }
 
     return blockHeight
   }
@@ -343,11 +351,13 @@ export class MoneroEngine implements EdgeCurrencyEngine {
       }
 
       this.updateOnAddressesChecked(transactions.length, transactions.length)
-      // Update the seenTxCheckpoint state:
-      this.seenTxCheckpoint = seenTxCheckpoint
-      this.edgeTxLibCallbacks.onSeenTxCheckpoint(
-        wasSeenTxCheckpoint(this.seenTxCheckpoint)
-      )
+      // Only update the seenTxCheckpoint if it actually advanced:
+      const newCheckpoint = wasSeenTxCheckpoint(seenTxCheckpoint)
+      const oldCheckpoint = wasSeenTxCheckpoint(this.seenTxCheckpoint)
+      if (newCheckpoint !== oldCheckpoint) {
+        this.seenTxCheckpoint = seenTxCheckpoint
+        this.edgeTxLibCallbacks.onSeenTxCheckpoint(newCheckpoint)
+      }
     } catch (e) {
       this.log.error('checkTransactionsInnerLoop', e)
     }
@@ -457,10 +467,8 @@ export class MoneroEngine implements EdgeCurrencyEngine {
   doInitialCallbacks(): void {
     for (const tokenId of this.walletLocalData.enabledTokens) {
       try {
-        this.edgeTxLibCallbacks.onTokenBalanceChanged(
-          tokenId,
-          this.walletLocalData.totalBalances.get(tokenId) ?? '0'
-        )
+        const _bal = this.walletLocalData.totalBalances.get(tokenId) ?? '0'
+        this.edgeTxLibCallbacks.onTokenBalanceChanged(tokenId, _bal)
       } catch (e) {
         this.log.error('Error for currencyCode', tokenId, e)
       }
diff --git a/test/engine/engine.ts b/test/engine/engine.ts
index 922ec8f..3bd683c 100644
--- a/test/engine/engine.ts
+++ b/test/engine/engine.ts
@@ -73,7 +73,6 @@ for (const fixture of fixtures) {
     },
     onUnactivatedTokenIdsChanged() {},
     onStakingStatusChanged() {},
-    onSubscribeAddresses() {},
     onWcNewContractCall(payload) {
       emitter.emit('wcNewContractCall', payload)
     },