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    <title>Mojang Studios Jira</title>
    <link>https://bugs.mojang.com</link>
    <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-19359] Nether lags dedicated servers</title>
                <link>https://bugs.mojang.com/browse/BDS-19359</link>
                <project id="11700" key="BDS">Bedrock Dedicated Server</project>
                    <description>&lt;p&gt;This has been a bug for quite some time, the Nether lags dedicated servers. If someone is in the Nether it completely lags out the server. However once the nether eventually loads for the player CPU usage drops back to standard levels, however the world in all 3 dimensions is incredibly laggy. Eating can take 4-5 attempts, blocks break and place eratically, and so on.&lt;/p&gt;</description>
                <environment></environment>
        <key id="560736">BDS-19359</key>
            <summary>Nether lags dedicated servers</summary>
                <type id="1" iconUrl="https://bugs.mojang.com/secure/viewavatar?size=xsmall&amp;avatarId=18903&amp;avatarType=issuetype">Bug</type>
                                    <status id="4" iconUrl="https://bugs.mojang.com/images/icons/statuses/reopened.png" description="This issue was once resolved, but the resolution was deemed incorrect. From here issues are either marked assigned or resolved.">Reopened</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="BuzzingSniper38">BuzzingSniper38</reporter>
                        <labels>
                    </labels>
                <created>Fri, 14 Jun 2024 07:07:48 +0200</created>
                <updated>Fri, 10 Jan 2025 03:55:37 +0100</updated>
                                            <version>1.21.0</version>
                    <version>1.21.40</version>
                                                            <votes>15</votes>
                                    <watches>10</watches>
                                                                            <comments>
                            <comment id="1374179" author="JIRAUSER531060" created="Fri, 10 Jan 2025 03:54:51 +0100"  >&lt;p&gt;&#160;I have this issue on my BDS as well and made a ticket about it last year here: &lt;a href=&quot;https://bugs.mojang.com/browse/BDS-19244&quot; title=&quot;High render distance causes long Nether loading&quot; class=&quot;issue-link&quot; data-issue-key=&quot;BDS-19244&quot;&gt;BDS-19244&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Interestingly, my server&apos;s issue is a bit different than the ones described here and at &lt;a href=&quot;https://bugs.mojang.com/browse/BDS-19101&quot; title=&quot;Entering a nether portal causes 100% CPU every time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;BDS-19101&quot;&gt;BDS-19101&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;I have the long nether loading time, which is alleviated when turning the render distance down. Also have chunks that refuse to load for 30+ seconds, which is present even with lowest render distance. However, eating and flying are normal (not laggy as described in this ticket). And server CPU usage does not spike to 100% but goes up to around 60% for the duration of loading.&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://bugs.mojang.com/secure/attachment/601374/601374_cpu+usage.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;</comment>
                            <comment id="1344955" author="proulx417" created="Fri, 9 Aug 2024 21:08:09 +0200"  >&lt;p&gt;I have the same isue like you with my server 1.21.3.01&lt;br/&gt;
I have 48 core 768gb ram but 100% cpu on all core when someone go in nether. with any cpu core (4,8 16 or all core) and options in config file&lt;/p&gt;</comment>
                            <comment id="1344828" author="yayalove2/16/2018" created="Fri, 9 Aug 2024 04:08:28 +0200"  >&lt;p&gt;I can confirm this is still an issue as is &lt;a href=&quot;https://bugs.mojang.com/browse/BDS-19101&quot; title=&quot;Entering a nether portal causes 100% CPU every time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;BDS-19101&quot;&gt;BDS-19101&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;We are running a BDS server with 6 cores and it&apos;s maxing out or CPU on multiple cores when people go into the Nether.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="1340558" author="JIRAUSER787270" created="Mon, 22 Jul 2024 06:57:39 +0200"  >&lt;p&gt;@Ian plant How &apos;drastic&apos;?&#160; I set mine to 50000 and was still seeing issues.&#160; I guess I could max it out but was wondering how high you went.&#160; Maybe there&apos;s a &quot;sweet spot&quot;&lt;/p&gt;</comment>
                            <comment id="1338465" author="JIRAUSER713762" created="Thu, 11 Jul 2024 23:14:24 +0200"  >&lt;p&gt;Can confirm this is still an issue in version 1.21.2.02&lt;/p&gt;</comment>
                            <comment id="1335018" author="JIRAUSER713762" created="Thu, 27 Jun 2024 15:43:19 +0200"  >&lt;p&gt;@Ian plant could you share what you did that fixed your issue?&lt;/p&gt;</comment>
                            <comment id="1335000" author="JIRAUSER487899" created="Thu, 27 Jun 2024 14:08:21 +0200"  >&lt;p&gt;It was a brand new world. The server was very busy between 20-30 players online at a time. We found a fix which was drastically increasing the compression number on the server. It fixed both issues&lt;/p&gt;</comment>
                            <comment id="1334363" author="jarl-penguin" created="Tue, 25 Jun 2024 00:21:35 +0200"  >&lt;p&gt;&lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=guruplant&quot; class=&quot;user-hover&quot; rel=&quot;guruplant&quot;&gt;guruplant&lt;/a&gt; Would you be able to provide a copy of an affected world?&lt;/p&gt;</comment>
                            <comment id="1332302" author="JIRAUSER487899" created="Tue, 18 Jun 2024 15:35:13 +0200"  >&lt;p&gt;Our server is suffering from the same issue, as well as &lt;a href=&quot;https://bugs.mojang.com/browse/BDS-19101&quot; title=&quot;Entering a nether portal causes 100% CPU every time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;BDS-19101&quot;&gt;BDS-19101&lt;/a&gt;.&#160; Going through a portal can takes minutes to happen and the CPU usage spikes to 100% throughout that time.&#160; However once the nether eventually loads for the player CPU usage drops back to standard levels, however the world in all 3 dimensions is incredibly laggy.&#160; eating can take 4-5 attempts, blocks break and place eratically, and so on6&lt;/p&gt;</comment>
                            <comment id="1331077" author="buzzingsniper38" created="Fri, 14 Jun 2024 19:57:13 +0200"  >&lt;p&gt;The CPU only got as high as 17% and immediately dropped down to around 3% after loading the nether.&lt;/p&gt;

&lt;p&gt;When entering the nether it lags the entire server including the overworld dimension and continues to lag until the user(s) leave the nether dimension, after they leave the lag is gone and everything goes back to normal, have also noticed when moving around in the nether chunks take awhile to load they&apos;re just giant areas of emptiness until they do load&#160;&lt;/p&gt;</comment>
                            <comment id="1330938" author="jarl-penguin" created="Fri, 14 Jun 2024 13:05:55 +0200"  >&lt;p&gt;Would &lt;a href=&quot;https://bugs.mojang.com/browse/BDS-19101&quot; title=&quot;Entering a nether portal causes 100% CPU every time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;BDS-19101&quot;&gt;BDS-19101&lt;/a&gt; describe your issue?&lt;/p&gt;</comment>
                            <comment id="1330888" author="buzzingsniper38" created="Fri, 14 Jun 2024 11:27:10 +0200"  >&lt;p&gt;I personally cannot as I am not the owner of these servers, I admin one but the rest of the information has come from other users using different hosts and it&apos;s the same results, even loaded up a brand new world and going in causes this&#160;&lt;/p&gt;</comment>
                            <comment id="1330851" author="goldenhelmet" created="Fri, 14 Jun 2024 10:22:20 +0200"  >&lt;p&gt;Can you provide a copy of an affected world?&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10102">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="572023">BDS-19851</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10103">
                    <name>Relates</name>
                                                                <inwardlinks description="relates to">
                                        <issuelink>
            <issuekey id="556503">BDS-19244</issuekey>
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            <issuelink>
            <issuekey id="552018">BDS-19101</issuekey>
        </issuelink>
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                <attachments>
                            <attachment id="601374" name="cpu usage.png" size="12374" author="RogueCheddar" created="Fri, 10 Jan 2025 03:54:45 +0100"/>
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