diff --git a/deploy/clowdapp.yml b/deploy/clowdapp.yml
index 0c4f086..b2700f7 100644
--- a/deploy/clowdapp.yml
+++ b/deploy/clowdapp.yml
@@ -110,3 +110,6 @@ parameters:
 - description: Retention time span for pdf in MS (8 hours default)
   name: ENTRY_TIMEOUT
   value: "28800000"
+- description: Amount of worker threads that puppeteer-cluster will use
+  name: MAX_CONCURRENCY
+  value: 2
diff --git a/src/common/pdfCache.ts b/src/common/pdfCache.ts
index ce26de9..f14835f 100644
--- a/src/common/pdfCache.ts
+++ b/src/common/pdfCache.ts
@@ -154,8 +154,13 @@ class PdfCache {
     return [];
   }
 
-  // Function to sort PDFComponents by order
+  // Sort the components by their internal `order` and
+  // return the sorted components in ascending order
   private sortComponents(components: PDFComponent[]): PDFComponent[] {
+    // No point in sorting a slice of length 1
+    if (components.length < 2) {
+      return components;
+    }
     return components.slice().sort((a, b) => {
       const orderA = a.order || Number.MAX_VALUE;
       const orderB = b.order || Number.MAX_VALUE;
@@ -163,6 +168,7 @@ class PdfCache {
       return orderA - orderB;
     });
   }
+
   private updateCollectionState(
     collectionId: string,
     status: PdfStatus,
diff --git a/src/server/cluster.ts b/src/server/cluster.ts
index b8aa5a5..9299599 100644
--- a/src/server/cluster.ts
+++ b/src/server/cluster.ts
@@ -5,9 +5,10 @@ const BROWSER_TIMEOUT = 60_000;
 import { CHROMIUM_PATH } from '../browser/helpers';
 
 export const GetPupCluster = async () => {
+  const CONCURRENCY_DEFAULT = 2;
   const cluster = await Cluster.launch({
     concurrency: Cluster.CONCURRENCY_CONTEXT,
-    maxConcurrency: 3,
+    maxConcurrency: Number(process.env.MAX_CONCURRENCY) || CONCURRENCY_DEFAULT,
     // If a queued task fails, how many times will it retry before returning an error
     retryLimit: 2,
     puppeteerOptions: {