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    <title>Mojang Studios Jira</title>
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    <description>This file is an XML representation of an issue</description>
    <language>en</language>    <build-info>
        <version>9.12.2</version>
        <build-number>9120002</build-number>
        <build-date>10-01-2024</build-date>
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<item>
            <title>[BDS-355] Entering the Nether creates permanent server lag until restart</title>
                <link>https://bugs.mojang.com/browse/BDS-355</link>
                <project id="11700" key="BDS">Bedrock Dedicated Server</project>
                    <description>&lt;p&gt;My server generally runs fine until a player enters a Nether portal, after which the lag increases (or maybe tick rate drops?) significantly.&#160; Mobs and players become extremely choppy and block updates (e.g., mining/harvesting) take excessively long to process.&#160; This lag persists in the overworld even when players return from the Nether.&#160; All clients are on modern Windows 10 PCs and run fine before entering the Nether, so it&apos;s not likely a client problem.&#160; The only way to clear the lag seems to be to restart the server.&lt;/p&gt;</description>
                <environment>BDS 1.8.0.24 on Ubuntu 18.04 Server</environment>
        <key id="223124">BDS-355</key>
            <summary>Entering the Nether creates permanent server lag until restart</summary>
                <type id="1" iconUrl="https://bugs.mojang.com/secure/viewavatar?size=xsmall&amp;avatarId=18903&amp;avatarType=issuetype">Bug</type>
                                    <status id="5" iconUrl="https://bugs.mojang.com/images/icons/statuses/resolved.png" description="A resolution has been taken, and it is awaiting verification by reporter. From here issues are either reopened, or are closed.">Resolved</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="7">Invalid</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="Tofulisk">Michael Petter</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Jan 2019 08:12:08 +0100</created>
                <updated>Mon, 10 Feb 2020 11:56:10 +0100</updated>
                            <resolved>Mon, 10 Feb 2020 11:56:10 +0100</resolved>
                                    <version>1.6.1.0</version>
                                                            <votes>2</votes>
                                    <watches>2</watches>
                                                                            <comments>
                            <comment id="631806" author="ionicecko" created="Mon, 10 Feb 2020 06:06:03 +0100"  >&lt;p&gt;Looks like this one got sorted!&lt;/p&gt;

&lt;p&gt;Could a mod please close this issue.&lt;/p&gt;</comment>
                            <comment id="517360" author="mr_daemon" created="Thu, 7 Feb 2019 03:46:22 +0100"  >&lt;p&gt;I went in and /kill&apos;d all entities, upon return new mobs had spawned in and the problem is indeed gone for now.&lt;/p&gt;

&lt;p&gt;Thanks!&lt;/p&gt;</comment>
                            <comment id="517340" author="crezz estamio" created="Thu, 7 Feb 2019 02:56:47 +0100"  >&lt;p&gt;You are probably experiencing the effects of mobs not despawning bug do a kill command to pigman and ghasts. that should clear your lag&lt;/p&gt;</comment>
                            <comment id="517059" author="mr_daemon" created="Wed, 6 Feb 2019 02:22:37 +0100"  >&lt;p&gt;Updated to 1.9.0.15 which released today, the problem is still present and somewhat amplified &#8211; whenever someone loads a dimension of any kind (on connect or through a portal), now all CPU cores of my server are pegged to 100% for an unreasonably long while, and the tickrate gets really horrible. It eventually stabilizes.&lt;/p&gt;

&lt;p&gt;The nether seems to still peg a single core to 100% depending on where you stand inside it.&lt;/p&gt;</comment>
                            <comment id="516956" author="mr_daemon" created="Tue, 5 Feb 2019 16:08:18 +0100"  >&lt;p&gt;Also affected on 1.8.1.2 on Ubuntu 18.04 LTS, I&apos;ve been testing and one single CPU core gets pegged to 100% once someone reaches a specific area of the nether. It will however go back to normal if everyone exits/re-enters. It will also immediately trigger again once players take a few steps in one direction.&lt;/p&gt;

&lt;p&gt;Memory remains stable the whole time. Restarting the server while someone is in the nether doesn&apos;t seem to help either, as they will immediately trigger the condition again.&lt;/p&gt;</comment>
                            <comment id="511864" author="ginkeltjes" created="Sat, 12 Jan 2019 16:25:45 +0100"  >&lt;p&gt;We have the same problem. When ever someone is entering the Nether the server starts lagging like crazy. It does how ever goes away when people leave the Nether.&lt;/p&gt;</comment>
                            <comment id="510938" author="tofulisk" created="Tue, 8 Jan 2019 05:02:39 +0100"  >&lt;p&gt;I added memory and the server is still lagging.&#160; CPU usage is &amp;lt;25% and memory usage on the host is less than 75% (swap partition space isn&apos;t even touched yet), and I&apos;m still getting the lag.&lt;/p&gt;</comment>
                            <comment id="509789" author="tofulisk" created="Wed, 2 Jan 2019 09:09:06 +0100"  >&lt;p&gt;I think I need to further profile CPU/memory as users grow as well.&#160; Testing with single player on server, it&apos;s not happening.&lt;/p&gt;</comment>
                            <comment id="509788" author="tofulisk" created="Wed, 2 Jan 2019 09:07:20 +0100"  >&lt;p&gt;Also, server CPU normally runs around 20-25%, but spikes to 100% when the Nether is entered, then drops again to normal after &quot;generating terrain&quot; completes on the client.&lt;/p&gt;</comment>
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