DaemonUmbra

What do you mean by "the website" and please provide a url

Please refer to Optifine's changelog regarding Forge compatibility

Sounds like you don't have Java installed. I recommend getting Java 8 HotSpot from https://adoptopenjdk.net

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

If it crashes without Optifine, please provide a debug.log without Optifine installed

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

Can you provide a debug.log from a run without Optifine?

Please don't necro ancient threads for unsupported versions.

I don't see anything helpful here, how long have you let it sit frozen? If a world tick takes a full minute it should crash with info about what each thread was doing when the world stopped.

Is there any change if you remove Optifine?

1.8 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

Please provide client and server debug.logs using one of the paste sites listed in my signature below (I shouldn't need to make a Ubuntu account just to get the paste as raw text)

The filenames of one or more of your mods suggests you got them from a repost site. Please read up on the StopModReposts project (link in my signature) for info on why this is a bad thing.

There aren't any Forge-compatible versions of 1.15.2 Optifine yet, you can check this in the changelog of each Optifine version.

Does anything change if you try the most recent version of Forge?

1.10 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

We don't support editing other people's mods without permission, and 1.12.2 is no longer supported.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

Placeable Items 4.0.0 is for 1.14.4, not 1.15.2

If your Java is in Program Files (x86) then it's 32-Bit and you might as well uninstall it and install 64-Bit Java

1.7 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

Still don't understand why people feel the need to uninstall Forge when they can simply... not use it

Please provide debug.log as described in the EAQ and the logs section of my signature below

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.