diff --git a/src/utils/upload.ts b/src/utils/upload.ts
index 9924e9d..9540463 100644
--- a/src/utils/upload.ts
+++ b/src/utils/upload.ts
@@ -46,11 +46,12 @@ export function uploadZip({url, zipStream, zipSize, onProgress}: UploadProps): P
 
   const progressStream = createProgressStream(zipSize, (sent, total) => {
     const elapsedSeconds = (Date.now() - startTime) / 1000
+    const speedMBps = elapsedSeconds < 0.001 ? 0 : sent / elapsedSeconds / 1024 / 1024
     onProgress({
       progress: total ? sent / total : 0,
       loadedBytes: sent,
       totalBytes: total,
-      speedMBps: sent / elapsedSeconds / 1024 / 1024,
+      speedMBps,
       elapsedSeconds,
     })
   }, ON_PROGRESS_THROTTLE_MS)
diff --git a/src/utils/zip.ts b/src/utils/zip.ts
index 407f097..572e400 100644
--- a/src/utils/zip.ts
+++ b/src/utils/zip.ts
@@ -47,13 +47,14 @@ export async function createZip({files, outputPath, onProgress}: CreateZipProps)
 
     const progressStream = createProgressStream(estimatedZipSize, (written, total) => {
       const elapsedSeconds = (Date.now() - startTime) / 1000
+      const speedMBps = elapsedSeconds < 0.001 ? 0 : written / elapsedSeconds / 1024 / 1024
       onProgress({
         progress: total ? Math.min(1, written / total) : 0,
         writtenBytes: written,
         estimatedTotalBytes: total,
         sourceTotalBytes: totalSourceSize,
         elapsedSeconds,
-        speedMBps: written / elapsedSeconds / 1024 / 1024,
+        speedMBps,
       })
     }, ON_PROGRESS_THROTTLE_MS)