Here is the original myeclipse.ini file, please note that some paths are absolute and correspond to my local installation, you will have to change them accordingly.
Could you clarify the nature of the slowdowns you are experiencing? Does the workspace take too long to load, or is content assist slow, wizards delayed, etc.?
-clean
#utf8 (do not remove)
-install
C:\EclipseInstalls\MyEclipse CI-Prod
-startup
plugins/org.eclipse.equinox.launcher_1.6.400.v20210924-0641.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.2.400.v20211117-0650
--launcher.defaultAction
openFile
-vm
C:\EclipseInstalls\MyEclipse CI-Prod\binary\com.azul.zulu.jdk162.win32.x86_64_1.16.2\bin\javaw.exe
-vmargs
-Xms256m
-Xmx2048m
-XX:+UseG1GC
-XX:+UseStringDeduplication
-Dosgi.requiredJavaVersion=1.8
-Dosgi.nls.warnings=ignore
-Davailable.updates.autoexpand=true
-Djava.security.properties=./plugins/com.genuitec.myeclipse.legacy_14.0.0.20220202-0202/java.security
--illegal-access=debug
--add-modules=ALL-SYSTEM