DaemonUmbra

You need to use Java 8

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.

I usually use 4G, some content creators I know use a lot more. For the normal user I would say don't allocate more than 6 unless you have an absolute BEAST of a CPU to push the ram.

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

How much RAM are you giving to Minecraft?

Can you provide a log without Optifine? Also is it pure FPS or is there actual game lag?

SetupDecompWorkspace isn't a thing anymore, with 1.13 the system got rewritten. Try taking a look at one of these tutorials.

Killing this zombie, if you have an issue please make your own thread with logs.

Can you provide your debug.log using one of the paste sites in my signature?

When we say OpenJ9 we don't mean OpenJDK 9. To clarify there are two Java JVMs(the bit that actually reads and executes the Java bytecode) in the market right now: HotSpot, made by the OpenJDK community, and OpenJ9, made by IBM Both are implementations of the Java JVM Specification, and as long as you use Java correctly any code you write should work on both. However, Forge does not stay within the lines. Forge leverages implementation-specific and internal utilities of HotSpot to do its black magic, meaning it won't work on OpenJ9 that is different internally.

Please provide your debug.log using one of the paste sites in my signature below

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

Try without Optifine

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

Sounds like you don't have Java installed. You'll want Java 8 HotSpot: https://adoptopenjdk.net

Is it any better if you remove Optifine?

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.

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

You can change the JAVA_HOME envorinment variable to point to a Java 8 JDK on disk, as well as adding the Java 8 JDK to your IDE and making sure your IDE uses it

1.12 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.

Use Java 8

Click "Save" and make sure you have Java installed

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