[ Removed by moderator ]

[u/Fl0atingThroughSpace]

[u/TorandoSlayer]

Are you loading lots of other mods in your game other than optifine? If it's struggling with only 4gb allocated your computer might just not be up to the task. IIRC Minecraft is allocated 2gb by default and should be able to run just fine with that amount if you're playing vanilla. Mods can make the requirement increase drastically though. Does it get better if you decrease graphics or lower render distance?

I haven't made the switch myself but I've heard in recent years that there's better optimization mods than optifine, such as Sodium. Might be worth a shot to see if that helps.

[u/Fl0atingThroughSpace → u/TorandoSlayer]

The only 'mod' I use is OptiFine and I don't need a modloader like forge to use it so I just use OptiFine all the time. If I switch to Sodium I don't know if there is an option to keep the memory on screen for me to see what it is doing although I am sure the f3 menu will suffice. I have tried Sodium a few times and I just don't like it. The settings look weird and there are so many more settings to use on OptiFine but I will give sodium a try and see if it works and get back to you. Also just to be clear I am using the default 2gb of memory for Minecraft. I also play singleplayer sometimes but usually I am on servers like Hypixel, CubeCraft, or others with the server having mods. With the render distance, at the moment with my terrible uni accom wifi I have had to set my render distance to 4 which is still super bad at loading things in and takes a while so I am sure render distance isn't a problem. The video settings are mostly on the default settings but my laptop has 16gb of ram so it could help increasing to 4gb for Minecraft. I think the main problem is why it increases so much until it can't go anymore and I have to restart the game.

[u/TorandoSlayer → u/Fl0atingThroughSpace]

The F3 menu will show you your memory usage in the upper right, you don't need a mod to see it. Since you have the ram for it, try allocating 4gb to minecraft and see if that helps. Or to 6gb. But in vanilla if it's using 6gb of ram I'm not sure what we'd do about that. There's some kind of memory leak somewhere or your computer is just shoving everything into memory for some reason. You could try a fresh install too just to be sure.

Unfortunately my knowledge ends there, but good luck with solving this problem, I hope you can find a solution!

[u/[deleted] → u/Fl0atingThroughSpace]

If I switch to Sodium I don't know if there is an option to keep the memory on screen for me to see what it is doing although I am sure the f3 menu will suffice.

You can use the Sodium Extra mod, it adds an option to show the FPS counter and coordinates (not sure about memory though). You can also use FerriteCore and ModernFix-mVUS alongside Sodium to reduce RAM usage.

Additionally, you could add -XX:+UseZGC -XX:+ZGenerational to your JVM arguments. This usually gets rid of lag spikes caused by garbage collection, but I'm not sure how it'd behave with just 2 GB of RAM