From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <blake.galbreath@gmail.com>
Date: Thu, 26 Mar 2020 19:06:22 -0500
Subject: [PATCH] Configurable TPS Catchup


diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 9c176d77420ffe0acdb57b333602c5e2102660a6..9b757a89bc00deef41bd9adc614bbeff30975034 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -1220,7 +1220,13 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
                 } : this::haveTime);
                 this.profiler.popPush("nextTickWait");
                 this.mayHaveDelayedTasks = true;
-                this.delayedTasksMaxNextTickTimeNanos = Math.max(Util.getNanos() + i, this.nextTickTimeNanos);
+                // Purpur start - tps catchup
+                if (org.purpurmc.purpur.PurpurConfig.tpsCatchup) {
+                    this.delayedTasksMaxNextTickTimeNanos = Math.max(Util.getNanos() + i, this.nextTickTimeNanos);
+                } else {
+                    this.delayedTasksMaxNextTickTimeNanos = this.nextTickTimeNanos = curTime + i;
+                }
+                // Purpur end - tps catchup
                 this.waitUntilNextTick();
                 if (flag) {
                     this.tickRateManager.endTickWork();
diff --git a/src/main/java/org/purpurmc/purpur/PurpurConfig.java b/src/main/java/org/purpurmc/purpur/PurpurConfig.java
index a14879f4266c71b7493c05e105114590c6709045..909cfeba89c2370adc2eebf72ba8ad46d33bce7b 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurConfig.java
@@ -248,4 +248,9 @@ public class PurpurConfig {
         loggerSuppressUnrecognizedRecipeErrors = getBoolean("settings.logger.suppress-unrecognized-recipe-errors", loggerSuppressUnrecognizedRecipeErrors);
         loggerSuppressSetBlockFarChunk = getBoolean("settings.logger.suppress-setblock-in-far-chunk-errors", loggerSuppressSetBlockFarChunk);
     }
+
+    public static boolean tpsCatchup = true;
+    private static void tpsCatchup() {
+        tpsCatchup = getBoolean("settings.tps-catchup", tpsCatchup);
+    }
 }