The globe looks at the feed's posts only when the feed hands them over

GlobePanel built a string of every located post's place on each of its renders, the stats overlay's once a second
included: with two thousand posts loaded, a hundred kilobytes of formatting every second while the page sat idle. It
now looks at the posts only when the feed hands them over, and compares a hash. The feed perf test (Category=Perf)
loads 2000 posts as before (49 s, against 55.6 s for 1740 in the baseline run).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

Components/Feed/GlobePanel.razor

@@ -67,11 +67,15 @@
 	DotNetObjectReference<GlobePanel> reference;
 	PeriodicTimer statsTimer;
 	readonly CancellationTokenSource cancellation = new();
-	string sentFingerprint;
+	int? sentFingerprint;
+	// the posts are looked at again only when the feed hands them over, never on the stats overlay's own renders
+	bool postsHandedOver = true;
 	GlobeStats stats;
 
 	protected override void OnInitialized() => IsLoading = false;
 
+	protected override void OnParametersSet() => postsHandedOver = true;
+
 	protected override async Task OnAfterRenderAsync(bool firstRender)
 	{
 		await base.OnAfterRenderAsync(firstRender);
@@ -86,8 +90,12 @@
 				statsTimer = new(TimeSpan.FromSeconds(1));
 				_ = ReadStats(cancellation.Token);
 			}
+			if (postsHandedOver)
+			{
+				postsHandedOver = false;
 				await SendPosts();
 			}
+		}
 		catch (JSDisconnectedException)
 		{
 		}
@@ -105,7 +113,17 @@
 
 		var located = Posts.Where(p => p.Location is not null).ToList();
 		var self = InstanceService.Known(InstanceService.SelfHost);
-		var fingerprint = string.Join('|', located.Select(p => $"{p.Key}:{p.Location.Latitude}:{p.Location.Longitude}:{p.Location.CdnKey}")) + $"#{self?.Geo?.Latitude}";
+		// a hash, not a string of every place: a feed of thousands is looked at on every page it loads
+		var hash = new HashCode();
+		foreach (var post in located)
+		{
+			hash.Add(post.Key);
+			hash.Add(post.Location.Latitude);
+			hash.Add(post.Location.Longitude);
+			hash.Add(post.Location.CdnKey);
+		}
+		hash.Add(self?.Geo?.Latitude);
+		var fingerprint = hash.ToHashCode();
 		if (fingerprint == sentFingerprint)
 			return;
 		sentFingerprint = fingerprint;