Im not sure if WO uses your windows java or its own installation thesedays.
but, if it uses what you installed on Windows, head to your java control panel (see image) and type in runtime parameters.
There are other ways but hopefully you have access to this interface. If you can't find the control panel applet, from cmd.exe its location is here <JRE installation home> \bin\javacpl.exe
As for what to type... https://alvinalexander.com/blog/post/java/java-xmx-xms-memory-heap-size-control/
Don't worry about CLASSPATH unless you want to set it up differently for more than one app.
-Xnoclassgc disable class garbage collection
-Xms set initial Java heap size
-Xmx set maximum Java heap size
-Xss set java thread stack size
I have never tried the top one. might be worth checking out.
Someone else might, respond to your question with simpler instructions, maybe a drop down where u can simply make a choice instead of this polava but im unsure if that exists. I do feel like ive forgotten something i used to know so who knows.
There is no way to force W-U to use your native java despite overridejavapath being written and the jittering is caused by the garbage collector.
It can be programmed to happen more often in a less noticeable way or less often in a more noticeable way and is far worse in J7.
Least with WO u can use your native java which.. is upgradeable. <edit - no longer true>
Anyone else wanna chip in with an easier solution, please do.
The Minecraft Launcher (java version) makes it a little easier and might provide some insight despite its irrelevance here https://cubedhost.com/help/en/articles/1648388-how-do-i-allocate-more-memory-to-my-minecraft-launcher-client-side @Finnnmight be able to help, i believe there's new code that's been added into the client jnlp in recent years that you could possibly edit.