Due to some testing of issue #2233 i try to set some other memory parameters for the java vm. (-Xms and -Xmx...)
As i can see in the preference.txt file, it's possible to set an option part as i can set initial and max memory for the vm.

run.options=-Xms256m -Xmx1024m
run.options.memory=false
run.options.memory.initial=256
run.options.memory.maximum=256

There are 2 preferences.txrt files. One in the arduino install directory (which seem's to be the default one) and one in /AppData/Roaming/Arduino15/. But both will not work in any case. I have tried many different options, run.options.memory=false or run.options.memory=true
run.options= or run.options=-Xms256m -Xmx1024m but nothing changes the default behavier with -Xms128m and -Xmx128m...