diff --git a/web/base_viewer.js b/web/base_viewer.js
index df9188c0e..2c343200e 100644
--- a/web/base_viewer.js
+++ b/web/base_viewer.js
@@ -115,6 +115,10 @@ function PDFPageViewBuffer(size) {
       data.shift().destroy();
     }
   };
+
+  this.has = function (view) {
+    return data.includes(view);
+  };
 }
 
 function isSameScale(oldScale, newScale) {
@@ -1113,6 +1117,32 @@ class BaseViewer {
     });
   }
 
+  /**
+   * @param {number} pageNumber
+   */
+  isPageCached(pageNumber) {
+    if (!this.pdfDocument || !this._buffer) {
+      return false;
+    }
+    if (
+      !(
+        Number.isInteger(pageNumber) &&
+        pageNumber > 0 &&
+        pageNumber <= this.pagesCount
+      )
+    ) {
+      console.error(
+        `${this._name}.isPageCached: "${pageNumber}" is not a valid page.`
+      );
+      return false;
+    }
+    const pageView = this._pages[pageNumber - 1];
+    if (!pageView) {
+      return false;
+    }
+    return this._buffer.has(pageView);
+  }
+
   cleanup() {
     for (let i = 0, ii = this._pages.length; i < ii; i++) {
       if (
diff --git a/web/interfaces.js b/web/interfaces.js
index bd29db6f3..0925417a2 100644
--- a/web/interfaces.js
+++ b/web/interfaces.js
@@ -95,6 +95,11 @@ class IPDFLinkService {
    * @param {number} pageNumber
    */
   isPageVisible(pageNumber) {}
+
+  /**
+   * @param {number} pageNumber
+   */
+  isPageCached(pageNumber) {}
 }
 
 /**
diff --git a/web/pdf_link_service.js b/web/pdf_link_service.js
index c484d9f5d..fc7016fd4 100644
--- a/web/pdf_link_service.js
+++ b/web/pdf_link_service.js
@@ -458,6 +458,13 @@ class PDFLinkService {
   isPageVisible(pageNumber) {
     return this.pdfViewer.isPageVisible(pageNumber);
   }
+
+  /**
+   * @param {number} pageNumber
+   */
+  isPageCached(pageNumber) {
+    return this.pdfViewer.isPageCached(pageNumber);
+  }
 }
 
 function isValidExplicitDestination(dest) {
@@ -609,6 +616,13 @@ class SimpleLinkService {
   isPageVisible(pageNumber) {
     return true;
   }
+
+  /**
+   * @param {number} pageNumber
+   */
+  isPageCached(pageNumber) {
+    return true;
+  }
 }
 
 export { PDFLinkService, SimpleLinkService };
diff --git a/web/pdf_thumbnail_view.js b/web/pdf_thumbnail_view.js
index bf325ec6d..633f8ab65 100644
--- a/web/pdf_thumbnail_view.js
+++ b/web/pdf_thumbnail_view.js
@@ -363,6 +363,16 @@ class PDFThumbnailView {
         finishRenderTask(error);
       }
     );
+    // Only trigger cleanup, once rendering has finished, when the current
+    // pageView is *not* cached on the `BaseViewer`-instance.
+    resultPromise.finally(() => {
+      const pageCached = this.linkService.isPageCached(this.id);
+      if (pageCached) {
+        return;
+      }
+      this.pdfPage?.cleanup();
+    });
+
     return resultPromise;
   }