batch retrieve the applicants' details in group of 20

content.js

@@ -67,6 +67,37 @@ async function getApplicant(applicant, token, onProgress = () => { }) {
   return downloadApplicantFilesWithProgress(applicantDetails, token, onProgress)
 }
 
+async function runWithConcurrencyLimit(items, limit, worker) {
+  const results = new Array(items.length)
+  let nextIndex = 0
+
+  async function runNext() {
+    const currentIndex = nextIndex
+    nextIndex += 1
+
+    if (currentIndex >= items.length) {
+      return
+    }
+
+    try {
+      results[currentIndex] = {
+        status: "fulfilled",
+        value: await worker(items[currentIndex], currentIndex)
+      }
+    } catch (error) {
+      results[currentIndex] = {
+        status: "rejected",
+        reason: error
+      }
+    }
+
+    await runNext()
+  }
+
+  await Promise.all(Array.from({ length: Math.min(limit, items.length) }, () => runNext()))
+  return results
+}
+
 async function getApplicants() {
   const aid = getApplicationId()
   const token = await getXSRFToken()
@@ -415,7 +446,7 @@ function rip(event) {
         progressDialog.initializeApplicant(applicant)
       })
 
-      const applicantDetailsResults = await Promise.allSettled(applicants.map(async (applicant) => {
+      const applicantDetailsResults = await runWithConcurrencyLimit(applicants, 20, async (applicant) => {
         progressDialog.setStatus("Downloading applicant files (will take some time)...")
         try {
           const applicantDetails = await getApplicant(applicant, token, ({ downloaded, total, bytes }) => {
@@ -426,7 +457,7 @@ function rip(event) {
           progressDialog.markApplicantFailed(applicant)
           throw error
         }
-      }))
+      })
 
       console.log("Preparing zip archive...")
       progressDialog.setStatus("Preparing zip archive...")