diff --git a/src/module49.ts b/src/module49.ts
index 87f568a..2f7b9da 100644
--- a/src/module49.ts
+++ b/src/module49.ts
@@ -59,7 +59,7 @@ export class Module49 {
    */
   public processStreamBatch(items: StreamBatchItem49[]): Module49Result[] {
     const startTime = performance.now();
-    const results: Module49Result[] = new Array(items.length);
+    const results: Module49Result[] = [];
 
     for (let i = 0; i < items.length; i += this.batchChunkSize) {
       const chunkEnd = Math.min(i + this.batchChunkSize, items.length);
@@ -67,7 +67,7 @@ export class Module49 {
         const item = items[j];
         if (!item) continue;
 
-        results[j] = this.processSingleItem(item);
+        results.push(this.processSingleItem(item));
       }
     }
 
@@ -83,7 +83,7 @@ export class Module49 {
    */
   public processSingleItem(item: StreamBatchItem49): Module49Result {
     const nowSec = item.timestamp ?? Math.floor(Date.now() / 1000);
-    const cacheKey = `${item.id}_${item.stream.withdrawn.toString()}_${item.stream.paused ? 1 : 0}_${nowSec}`;
+    const cacheKey = `${item.id}_${item.stream.withdrawn.toString()}_${item.stream.paused ? 1 : 0}_${item.stream.cancelled ? 1 : 0}_${item.stream.pausedAt}_${item.stream.ratePerSecond.toString()}_${item.stream.startTime}_${item.stream.endTime}_${nowSec}`;
 
     if (this.enableOptimization) {
       const cached = this.cache.get(cacheKey);
diff --git a/src/nonce/NonceManager.ts b/src/nonce/NonceManager.ts
index f027729..17f18e9 100644
--- a/src/nonce/NonceManager.ts
+++ b/src/nonce/NonceManager.ts
@@ -184,8 +184,9 @@ export class NonceManager {
 
     const { promise, cancel } = this.enqueue();
 
+    let timer: ReturnType<typeof setTimeout> | undefined;
     const timeoutPromise = new Promise<never>((_, reject) => {
-      setTimeout(() => {
+      timer = setTimeout(() => {
         cancel();
         reject(new Error(`NonceManager: acquire timed out after ${timeoutMs}ms`));
       }, timeoutMs);
@@ -198,6 +199,8 @@ export class NonceManager {
         throw err;
       }
       throw new Error(String(err));
+    } finally {
+      if (timer) clearTimeout(timer);
     }
   }
 
diff --git a/src/streams.ts b/src/streams.ts
index 26c725c..024b449 100644
--- a/src/streams.ts
+++ b/src/streams.ts
@@ -52,6 +52,33 @@ import { ConduitError, RateLimitError, InsufficientBalanceError, StreamErrorCode
  * Tracks which v1-deprecated methods have already warned this session, so
  * repeated calls (e.g. in a hot loop) do not spam the console.
  */
+/** Default concurrency limit for bounded page-fetching (Issue #549). */
+const DEFAULT_LIST_CONCURRENCY = 8;
+
+/**
+ * Runs `fn` over `items` with at most `concurrency` in-flight calls.
+ * Preserves result ordering to match a naive `Promise.all` fan-out.
+ */
+async function mapWithConcurrency<T, R>(
+  items: T[],
+  concurrency: number,
+  fn: (item: T) => Promise<R>,
+): Promise<R[]> {
+  const results = new Array<R>(items.length);
+  let index = 0;
+
+  async function worker() {
+    while (index < items.length) {
+      const i = index++;
+      results[i] = await fn(items[i]);
+    }
+  }
+
+  const workers = Array.from({ length: Math.min(concurrency, items.length) }, () => worker());
+  await Promise.all(workers);
+  return results;
+}
+
 const _warnedDeprecations = new Set<string>();
 
 /**
@@ -613,8 +640,10 @@ export class StreamsModule {
       // call would serially resolve the address and then simulate — 2 serial
       // RPCs per stream. Pre-warming collapses the address lookups into a
       // single parallel fan-out before the info simulations begin.
-      await Promise.all(ids.map(id => this._resolveAddr(id)));
-      const streams = await Promise.all(ids.map(id => this.get(id)));
+      // Bounded concurrency (#549) avoids hammering the RPC endpoint with
+      // up to 100 simultaneous simulateTransaction requests.
+      await mapWithConcurrency(ids, DEFAULT_LIST_CONCURRENCY, (id) => this._resolveAddr(id));
+      const streams = await mapWithConcurrency(ids, DEFAULT_LIST_CONCURRENCY, (id) => this.get(id));
       const hasNextPage = hasNextPageOverride ?? ids.length === limit;
       const totalCount = BigInt(offset + ids.length);
       return {