Hi Monti.
I give credit to Yves. Migrating the system to VMware should not slow down the SAP and DB.
For simplicity and because of the point mentioned by Yves, I would leave CI+DB o the same host (no need for SAPXPG destination and standalone Gateway Server,etc.)
But here is some concern from Oracle point of view. Oracle do not support any of its products in VMware environment, this means if you encounter up to now, unknown issues (mostly connected tomemory isues), you have may not get a solution directly to VMware. And so you should contact VMware support to get the issue resolved.
Regards,
János