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In the CWD: C:\Users\User\AppData\Roaming\.minecraft\
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When you launch Minecraft, the launcher spawn the process C:\Program Files (x86)\Minecraft Launcher\runtime\jre-圆4\bin\javaw.exe So its difficult to launch it from a comand line for diagnostic porpuses (For example attaching a RenderDoc process to it) If this means nothing to you, you can safely ignore these options.Minecraft is intended to be launched by the minecraft launcher to do login stuff, integrity verification, premium status check, etc. The commands have to finish running for the instance start/exit to proceed.
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If you know what you are doing, you can add some here. MultiMC generally adds most of the relevant JVM arguments itself, without any need for adding more. With 32bit java, the maximum is around 1500MB. You might want to set the numbers higher (about double the default sizes is generally OK). The MultiMC default memory settings are suitable for lightly modded instances or vanilla Minecraft.
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If you use integrated intel graphics on Windows, make sure to select the javaw.exe executable, not java.exe! Memory settings Here, you can either directly insert the java runtime you want to use, let MultiMC detect it automatically (probably the best option), look for it using a file browser and test the currently selected one. The settings are divided in sections, each with a checkbox, which enables the override. The instance settings allow you to override the global MultiMC settings for a particular instance.
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