Minecraft Client experiencing extreme lag on server

Is it normal for a client’s RAM usage to max out the moment they start Minecraft, even on the initial splash screen before they’ve even entered a world?

I’ve got a Fabric server and a user is getting ~20 FPS when before they averaged ~100ish. They didn’t check their usage prior to noticing the issue so can’t confirm what it was like before. The server is largely the same, the main changes are that mods were updated to the newest versions (not a MC version change, just the mod versions) and a couple new mods were added. I’m having them remove mods one at a time to troubleshoot but have yet to hear back.

I personally booted up completely vanilla MC and allocated the same amount of RAM but it only used around ~3GB during startup and on the splash screen, maybe even less. But the moment I load up the Fabric version with the mods installed, startup takes all 8GB and stays that high even on the splash screen.
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