5 files changed, 5 insertions, 6 deletions
diff --git a/src/SMAPI/Framework/PerformanceMonitoring/AlertContext.cs b/src/SMAPI/Framework/PerformanceMonitoring/AlertContext.cs
index 01197f74..af630055 100644
--- a/src/SMAPI/Framework/PerformanceMonitoring/AlertContext.cs
+++ b/src/SMAPI/Framework/PerformanceMonitoring/AlertContext.cs
@@ -1,7 +1,7 @@
 namespace StardewModdingAPI.Framework.PerformanceMonitoring
 {
     /// <summary>The context for an alert.</summary>
-    internal struct AlertContext
+    internal readonly struct AlertContext
     {
         /*********
         ** Accessors
diff --git a/src/SMAPI/Framework/PerformanceMonitoring/AlertEntry.cs b/src/SMAPI/Framework/PerformanceMonitoring/AlertEntry.cs
index f5b80189..d5a0b343 100644
--- a/src/SMAPI/Framework/PerformanceMonitoring/AlertEntry.cs
+++ b/src/SMAPI/Framework/PerformanceMonitoring/AlertEntry.cs
@@ -1,7 +1,7 @@
 namespace StardewModdingAPI.Framework.PerformanceMonitoring
 {
     /// <summary>A single alert entry.</summary>
-    internal struct AlertEntry
+    internal readonly struct AlertEntry
     {
         /*********
         ** Accessors
diff --git a/src/SMAPI/Framework/PerformanceMonitoring/PeakEntry.cs b/src/SMAPI/Framework/PerformanceMonitoring/PeakEntry.cs
index cff502ad..1746e358 100644
--- a/src/SMAPI/Framework/PerformanceMonitoring/PeakEntry.cs
+++ b/src/SMAPI/Framework/PerformanceMonitoring/PeakEntry.cs
@@ -3,7 +3,7 @@ using System;
 namespace StardewModdingAPI.Framework.PerformanceMonitoring
 {
     /// <summary>A peak invocation time.</summary>
-    internal struct PeakEntry
+    internal readonly struct PeakEntry
     {
         /*********
         ** Accessors
diff --git a/src/SMAPI/Framework/PerformanceMonitoring/PerformanceCounter.cs b/src/SMAPI/Framework/PerformanceMonitoring/PerformanceCounter.cs
index 3cf668ee..42825999 100644
--- a/src/SMAPI/Framework/PerformanceMonitoring/PerformanceCounter.cs
+++ b/src/SMAPI/Framework/PerformanceMonitoring/PerformanceCounter.cs
@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using Harmony;
 
 namespace StardewModdingAPI.Framework.PerformanceMonitoring
 {
@@ -57,7 +56,7 @@ namespace StardewModdingAPI.Framework.PerformanceMonitoring
             // add entry
             if (this.Entries.Count > this.MaxEntries)
                 this.Entries.Pop();
-            this.Entries.Add(entry);
+            this.Entries.Push(entry);
 
             // update metrics
             if (this.PeakPerformanceCounterEntry == null || entry.ElapsedMilliseconds > this.PeakPerformanceCounterEntry.Value.ElapsedMilliseconds)
diff --git a/src/SMAPI/Framework/PerformanceMonitoring/PerformanceCounterEntry.cs b/src/SMAPI/Framework/PerformanceMonitoring/PerformanceCounterEntry.cs
index 8adbd88d..18cca628 100644
--- a/src/SMAPI/Framework/PerformanceMonitoring/PerformanceCounterEntry.cs
+++ b/src/SMAPI/Framework/PerformanceMonitoring/PerformanceCounterEntry.cs
@@ -3,7 +3,7 @@ using System;
 namespace StardewModdingAPI.Framework.PerformanceMonitoring
 {
     /// <summary>A single performance counter entry.</summary>
-    internal struct PerformanceCounterEntry
+    internal readonly struct PerformanceCounterEntry
     {
         /*********
         ** Accessors