Even though my laptop has a decent 12 Gb of RAM, I still like to minimise the RAM allocated to PeopleSoft VMs.
My experience is that the sweet spot is 3072 Mb for VMs without SES – I never bother with the beast that is SES. After all it is a dead application – Elasticsearch cannot arrive soon enough for me. You can get away with 2560 Mb of RAM but you will see some swapping in OEL – not good even if you have a fast SSD. Mine is “ok” – a Samsung 1 TB 850 EVO but allowing any swapping still makes the system slow down considerably.