Lunar client is kinda bad on MacOS ngl.
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There is a memory eater in Lunar Client that takes hella ram (even when on low ram settings)
on 3gb ram (recommended value) it takes 5gb
on 2gb it... still takes 5gb anyway
so there might be a memory leak or something like that -
MacOS Sonoma introuced a "Game Mode" which "optimises" the CPU and GPU while gaming (not sure what it actually does). This mode typically activates when a game is in fullscreen. This is not true for Lunar Client or Minecraft in general.
Please fix these issues, it makes the experience worse.