SparklyPaperMC/sparklypaper-server/minecraft-patches/sources/net/minecraft/server/MinecraftServer.java.patch

--- a/net/minecraft/server/MinecraftServer.java
+++ b/net/minecraft/server/MinecraftServer.java
@@ -303,6 +_,7 @@
     public boolean isIteratingOverLevels = false; // Paper - Throw exception on world create while being ticked
     private final Set<String> pluginsBlockingSleep = new java.util.HashSet<>(); // Paper - API to allow/disallow tick sleeping
     public static final long SERVER_INIT = System.nanoTime(); // Paper - Lag compensation
+    public final Set<net.minecraft.world.entity.Entity> entitiesWithScheduledTasks = java.util.concurrent.ConcurrentHashMap.newKeySet(); // SparklyPaper - skip EntityScheduler's executeTick checks if there isn't any tasks to be run (concurrent because plugins may schedule tasks async)
 
     public static <S extends MinecraftServer> S spin(Function<Thread, S> threadFunction) {
         ca.spottedleaf.dataconverter.minecraft.datatypes.MCTypeRegistry.init(); // Paper - rewrite data converter system
@@ -1659,6 +_,18 @@
         this.server.getScheduler().mainThreadHeartbeat(); // CraftBukkit
         // Paper start - Folia scheduler API
         ((io.papermc.paper.threadedregions.scheduler.FoliaGlobalRegionScheduler) org.bukkit.Bukkit.getGlobalRegionScheduler()).tick();
+        // SparklyPaper - skip EntityScheduler's executeTick checks if there isn't any tasks to be run
+        for (final net.minecraft.world.entity.Entity entity : entitiesWithScheduledTasks) {
+            if (entity.isRemoved()) {
+                continue;
+            }
+
+            final org.bukkit.craftbukkit.entity.CraftEntity bukkit = entity.getBukkitEntityRaw();
+            if (bukkit != null) {
+                bukkit.taskScheduler.executeTick();
+            }
+        }
+        /*
         getAllLevels().forEach(level -> {
             for (final net.minecraft.world.entity.Entity entity : level.getEntities().getAll()) {
                 if (entity.isRemoved()) {
@@ -1670,6 +_,8 @@
                 }
             }
         });
+         */
+        // SparklyPaper end
         // Paper end - Folia scheduler API
         io.papermc.paper.adventure.providers.ClickCallbackProviderImpl.CALLBACK_MANAGER.handleQueue(this.tickCount); // Paper
         profilerFiller.push("commandFunctions");
@@ -1721,7 +_,16 @@
             profilerFiller.push("tick");
 
             try {
+                long i = Util.getNanos(); // SparklyPaper - track world's MSPT
                 serverLevel.tick(hasTimeLeft);
+                // SparklyPaper start - track world's MSPT
+                long j = Util.getNanos() - i;
+
+                // These are from the "tickServer" function
+                serverLevel.tickTimes5s.add(this.tickCount, j);
+                serverLevel.tickTimes10s.add(this.tickCount, j);
+                serverLevel.tickTimes60s.add(this.tickCount, j);
+                // SparklyPaper end
             } catch (Throwable var7) {
                 CrashReport crashReport = CrashReport.forThrowable(var7, "Exception ticking world");
                 serverLevel.fillReportDetails(crashReport);