diff --git a/services/settings/Attachments.sys.mjs b/services/settings/Attachments.sys.mjs
index 9047ba4ae9a7..9982c2766119 100644
--- a/services/settings/Attachments.sys.mjs
+++ b/services/settings/Attachments.sys.mjs
@@ -189,6 +189,9 @@ export class Downloader {
       return null;
     }
 
+    // Save attachments in bulks.
+    const BULK_SAVE_COUNT = 50;
+
     const url =
       (await lazy.Utils.baseAttachmentsURL()) +
       `bundles/${this.bucketName}--${this.collectionName}.zip`;
@@ -218,7 +221,13 @@ export class Downloader {
       const tmpZipFile = await IOUtils.getFile(tmpZipFilePath);
       zipReader.open(tmpZipFile);
 
-      for (const entryName of zipReader.findEntries("*.meta.json")) {
+      const cacheEntries = [];
+      const zipFiles = Array.from(zipReader.findEntries("*.meta.json"));
+      allSuccess = !!zipFiles.length;
+
+      for (let i = 0; i < zipFiles.length; i++) {
+        const lastLoop = i == zipFiles.length - 1;
+        const entryName = zipFiles[i];
         try {
           // 3. Read the meta.json entry
           const recordZStream = zipReader.getInputStream(entryName);
@@ -245,18 +254,31 @@ export class Downloader {
           const fileBytes = stream.readBytes(dataLength);
           const blob = new Blob([fileBytes]);
 
-          // 5. Save to cache
-          await this.cacheImpl.set(record.id, { record, blob });
+          cacheEntries.push([record.id, { record, blob }]);
 
           stream.close();
           zStream.close();
         } catch (ex) {
           lazy.console.warn(
-            `${this.bucketName}/${this.collectionName}: Unable to save attachment entry for ${entryName}.`,
+            `${this.bucketName}/${this.collectionName}: Unable to extract attachment of ${entryName}.`,
             ex
           );
           allSuccess = false;
         }
+
+        // 5. Save bulk to cache (last loop or reached count)
+        if (lastLoop || cacheEntries.length == BULK_SAVE_COUNT) {
+          try {
+            await this.cacheImpl.setMultiple(cacheEntries);
+          } catch (ex) {
+            lazy.console.warn(
+              `${this.bucketName}/${this.collectionName}: Unable to save attachments in cache`,
+              ex
+            );
+            allSuccess = false;
+          }
+          cacheEntries.splice(0); // start new bulk.
+        }
       }
     } catch (ex) {
       lazy.console.warn(
diff --git a/services/settings/Database.sys.mjs b/services/settings/Database.sys.mjs
index 266a70ed4a9d..43b5b4a5d1fc 100644
--- a/services/settings/Database.sys.mjs
+++ b/services/settings/Database.sys.mjs
@@ -233,22 +233,34 @@ export class Database {
   }
 
   async saveAttachment(attachmentId, attachment) {
+    return await this.saveAttachments([[attachmentId, attachment]]);
+  }
+
+  async saveAttachments(idsAndBlobs) {
     try {
       await executeIDB(
         "attachments",
         store => {
-          if (attachment) {
-            store.put({ cid: this.identifier, attachmentId, attachment });
-          } else {
-            store.delete([this.identifier, attachmentId]);
+          for (const [attachmentId, attachment] of idsAndBlobs) {
+            if (attachment) {
+              store.put({ cid: this.identifier, attachmentId, attachment });
+            } else {
+              store.delete([this.identifier, attachmentId]);
+            }
           }
         },
-        { desc: "saveAttachment(" + attachmentId + ") in " + this.identifier }
+        {
+          desc:
+            "saveAttachments(<" +
+            idsAndBlobs.length +
+            " items>) in " +
+            this.identifier,
+        }
       );
     } catch (e) {
       throw new lazy.IDBHelpers.IndexedDBError(
         e,
-        "saveAttachment()",
+        "saveAttachments()",
         this.identifier
       );
     }
diff --git a/services/settings/RemoteSettingsClient.sys.mjs b/services/settings/RemoteSettingsClient.sys.mjs
index 6b7c441c8d91..f1506d11dbd2 100644
--- a/services/settings/RemoteSettingsClient.sys.mjs
+++ b/services/settings/RemoteSettingsClient.sys.mjs
@@ -204,6 +204,9 @@ class AttachmentDownloader extends Downloader {
       set: async (attachmentId, attachment) => {
         return this._client.db.saveAttachment(attachmentId, attachment);
       },
+      setMultiple: async attachmentsIdsBlobs => {
+        return this._client.db.saveAttachments(attachmentsIdsBlobs);
+      },
       delete: async attachmentId => {
         return this._client.db.saveAttachment(attachmentId, null);
       },
diff --git a/services/settings/test/unit/test_attachments_downloader.js b/services/settings/test/unit/test_attachments_downloader.js
index 4db566e66800..66dc65c3b3b3 100644
--- a/services/settings/test/unit/test_attachments_downloader.js
+++ b/services/settings/test/unit/test_attachments_downloader.js
@@ -71,6 +71,9 @@ async function clear_state() {
     set: async (id, obj) => {
       downloader.cache[id] = obj;
     },
+    setMultiple: async idsObjs => {
+      idsObjs.forEach(([id, obj]) => (downloader.cache[id] = obj));
+    },
     delete: async id => {
       delete downloader.cache[id];
     },
@@ -100,6 +103,11 @@ async function clear_state() {
     response.setHeader("Content-Type", "application/json; charset=UTF-8");
     response.setStatusLine(null, 200, "OK");
   });
+
+  // For tests that use a real client and DB cache, clear the local DB too.
+  const client = RemoteSettings("some-collection");
+  await client.db.clear();
+  await client.db.pruneAttachments([]);
 }
 add_task(clear_state);
 
@@ -852,6 +860,30 @@ add_task(async function test_cacheAll_happy_path() {
   );
 });
 
+add_task(async function test_cacheAll_using_real_db() {
+  const client = RemoteSettings("some-collection");
+
+  const allSuccess = await client.attachments.cacheAll();
+
+  Assert.ok(
+    allSuccess,
+    "Attachments cacheAll succesfully downloaded a bundle and saved all attachments"
+  );
+
+  Assert.equal(
+    (await client.attachments.cacheImpl.get("2")).record.title,
+    "test2",
+    "Test record 2 meta content appears accurate."
+  );
+  Assert.equal(
+    await (await client.attachments.cacheImpl.get("2")).blob.text(),
+    "test2\n",
+    "Test file 2 content is accurate."
+  );
+});
+
+add_task(clear_state);
+
 add_task(async function test_cacheAll_skips_with_existing_data() {
   downloader.cache = {
     1: "1",
@@ -903,3 +935,23 @@ add_task(async function test_cacheAll_failed_unzip() {
 });
 
 add_task(clear_state);
+
+add_task(async function test_cacheAll_failed_save() {
+  const client = RemoteSettings("some-collection");
+
+  const backup = client.db.saveAttachments;
+  client.db.saveAttachments = () => {
+    throw new Error("boom");
+  };
+
+  const allSuccess = await client.attachments.cacheAll();
+
+  Assert.equal(
+    allSuccess,
+    false,
+    "Attachments cacheAll failed to save entries in DB and returned false"
+  );
+  client.db.saveAttachments = backup;
+});
+
+add_task(clear_state);