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Bug
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Resolution: Invalid
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None
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1.15.2
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None
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Linux – Fedora 30
java-1.8.0-openjdk.x86_64 or jre1.8.0_251-amd64
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Unconfirmed
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(Unassigned)
As I play on Hypixel, the game suddenly slows to a 3-4 fps crawl for at least 30 seconds. The CPU usage is not particularly high, and the memory usage is also normal, but the game becomes I/O-bound. Then it resumes at the regular frame rate. It works for a while (5-6 minutes, maybe) and then it slows down again. The cycle repeats.
I have seen this with 1.12.2 and 1.15.2. I have tried it with OpenJDK 1.8 and with Oracle JRE 1.8. It happens with both.
I tried adding more memory by modifying the default java parameters:
-XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=128M -Xmx8G -Xms4G
I tried logging out and logging into a bare minimum session (one terminal and the window manager) to conserve even more memory. The sudden slowdowns still happen.