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        <build-number>9120002</build-number>
        <build-date>10-01-2024</build-date>
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<item>
            <title>[MC-10501] Invisible entities infinite spawn loop (client side) using minecart spawners causing severe performance issues.</title>
                <link>https://bugs.mojang.com/browse/MC-10501</link>
                <project id="10400" key="MC">Minecraft: Java Edition</project>
                    <description>&lt;p&gt;I made a video to explain the issue: &lt;a href=&quot;http://www.youtube.com/watch?v=7buqPacrMdo&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.youtube.com/watch?v=7buqPacrMdo&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Issue happened when we noticed FPS going from 120 to 10 overtime close to spawners when we updated to 09b from 07a, re-logging can temporally fix it so it seems the invisible entities are client side bug.&lt;br/&gt;
(Confirmed with MCEDIT)&lt;/p&gt;

&lt;p&gt;Invisible Entities (&quot;I&quot; in the debugger) shown in the video are slowly increase and never clear the cache causing severe performance issues unless you relog.&lt;/p&gt;

&lt;p&gt;I&apos;ve attached a small world with 4 devices for you to test.&lt;/p&gt;

&lt;p&gt;This is important for map makers!&lt;/p&gt;</description>
                <environment>Tested using different setups.</environment>
        <key id="24460">MC-10501</key>
            <summary>Invisible entities infinite spawn loop (client side) using minecart spawners causing severe performance issues.</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="1">Fixed</resolution>
                                        <assignee username="dinnerbone">[Mojang] Nathan Adams</assignee>
                                    <reporter username="hypixel">Simon &quot;Hypixel&quot;</reporter>
                        <labels>
                            <label>minecart</label>
                            <label>spawner</label>
                    </labels>
                <created>Thu, 28 Feb 2013 05:40:43 +0100</created>
                <updated>Sat, 23 Jan 2016 15:29:34 +0100</updated>
                            <resolved>Thu, 28 Feb 2013 11:20:52 +0100</resolved>
                                    <version>Snapshot 13w09b</version>
                                    <fixVersion>Snapshot 13w09c</fixVersion>
                                                        <votes>2</votes>
                                    <watches>3</watches>
                                                                            <comments>
                            <comment id="48376" author="chewbacca" created="Thu, 28 Feb 2013 18:41:52 +0100"  >&lt;p&gt;Sorry, but i report this before you: &lt;a href=&quot;https://bugs.mojang.com/browse/MC-10455&quot; title=&quot;What is this?! Spawner bug in version 13w09b!&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-10455&quot;&gt;&lt;del&gt;MC-10455&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="48272" author="powierjl" created="Thu, 28 Feb 2013 10:01:05 +0100"  >&lt;p&gt;This is really annoying... Not existing entities make my computer lagging? What the...&lt;/p&gt;</comment>
                            <comment id="48251" author="asdjke" created="Thu, 28 Feb 2013 07:35:39 +0100"  >&lt;p&gt;This bug is really annoying and is effecting my creations also. It does need to be addressed!&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="24412">MC-10455</issuekey>
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            <issuelink>
            <issuekey id="24475">MC-10515</issuekey>
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                <attachments>
                            <attachment id="22720" name="SpawnerMinecart Device.rar" size="96143" author="hypixel" created="Thu, 28 Feb 2013 05:40:43 +0100"/>
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