Every time I load minecraft since 1.17 has come out and OpenJDK Platform binary has been used instead of the typical Java Platform SE binary that I'm used to seeing, it consumes 50% of my RAM on its own sitting on the main title screen(the rest of the ram usage is other processes open). It settles at about 85% when I stay on the title screen. I crash trying to load single player worlds, hitting 100% RAM usage, no matter how simple or complex the customization is. Worlds that I manage to get into lag horribly. This happens with optifine being used, and also without it. I have 8GB RAM and that has never been maxed out from Minecraft unless I'm loading an insane amount of mods. I loaded up version 1.15 and it had drastically reduced RAM usage and lag, only reaching 67% memory after loading into a new world with the same settings. I loaded up 1.16 and it also never peaked beyond 67% on title screen or in a world. I did not change anything between taking the screenshots I have listed other than opening each version of Minecraft individually to screenshot. It's insane that my computer can run crazy intense games just fine and any other version of minecraft, modded or not, but then crash from loading vanilla minecraft 1.17.1. The versions for each screenshot are according to their names. I have been playing the java versions of minecraft for years on this same computer without issue. This is the only version that has done this to this degree. This Ram issue the new binary platform is creating is unacceptable.
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Lunar and Badlion open Minecraft 1.17.1 or 1.17 every differently from the Minecraft Launcher trust me Lunar has crashed my Minecraft a lot if that does not work I do not know what will
Duplicates MC-219639
This is all in vanilla, no external or modded client is being used. 1.17 also uses the OpenJDK Platform binary instead of Java automatically. 1.17 actually runs at 92% of my Ram just from sitting on the title screen.
Update: This issue still exists, but I wanted to actually be able to play minecraft so I bought an extra 8gb of ram and with some fine tuning of optifine settings to turn off certain animated textures, I can now successfully play with minimal lag and no crashing. Personally my problem is resolved, but that should not have to be the solution for others having the same problem. I shouldn't have had to go buy double my ram capacity in order to play vanilla minecraft.
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We're tracking this issue in MC-188163 and MC-233802, so this ticket is being resolved and linked as a duplicate.
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Maybe try to open 1.17 in Java? Also, are you using Lunar Client on 1.17 by any chance? Lunar uses Open Platform and that might be the issue.