In the end, there is just only so much you can do.
This excerpt from an email explains the issue that the users were having when "loading the module": (note that it is edited to protect product secrets while context remains)
.... the [largest module source] uses 360MB of RAM to load the [items] (all 465,000 of them at just over 800 bytes each) from the [data source] and render the schematic on the screen. This is on top of the 170MB that the application usually requires.
With the latest changes, 98% of this RAM is either freed and released or reused when a different [module source] is opened but a user still requires 530MB of heap space for this to run .....
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