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 c442cf9a6856715ab7c404eb8e287bd67e20ae06..0d4d62757e7b15767ec62f59e287ab3a94be8c03 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -1218,7 +1218,13 @@ 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 308d7556f5b12c0aa5b2fde5a23ef6fbacb303de..e2edbb0842862b8ffdf30cec104a1d71a71e92e0 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);
+    }
 }