Update ui/src/lib/DownloadMonitor.svelte

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

1 files changed, 13 insertions, 6 deletions

diff --git a/ui/src/lib/DownloadMonitor.svelte b/ui/src/lib/DownloadMonitor.svelte
index 5dc8269..79adff5 100644
--- a/ui/src/lib/DownloadMonitor.svelte
+++ b/ui/src/lib/DownloadMonitor.svelte
@@ -83,12 +83,19 @@
         const timeDiff = (now - lastUpdateTime) / 1000; // seconds
         
         if (timeDiff >= 0.5) { // Update speed every 0.5 seconds
-          const bytesDiff = totalDownloadedBytes - lastTotalBytes;
-          const instantSpeed = bytesDiff / timeDiff;
-          // Smooth the speed with exponential moving average
-          downloadSpeed = downloadSpeed === 0 ? instantSpeed : downloadSpeed * 0.7 + instantSpeed * 0.3;
-          lastUpdateTime = now;
-          lastTotalBytes = totalDownloadedBytes;
+          // On the first update, initialize lastTotalBytes to avoid counting
+          // bytes downloaded before the timer window started.
+          if (lastTotalBytes === 0 && totalDownloadedBytes > 0) {
+            lastTotalBytes = totalDownloadedBytes;
+            lastUpdateTime = now;
+          } else {
+            const bytesDiff = totalDownloadedBytes - lastTotalBytes;
+            const instantSpeed = bytesDiff / timeDiff;
+            // Smooth the speed with exponential moving average
+            downloadSpeed = downloadSpeed === 0 ? instantSpeed : downloadSpeed * 0.7 + instantSpeed * 0.3;
+            lastUpdateTime = now;
+            lastTotalBytes = totalDownloadedBytes;
+          }
         }
 
         // Estimate remaining time based on files remaining