How do I optimize code using OOP (Algorithms are already optimized)

I am looking for general tips on how to further optimize my energy intensive functions, so I can run more stuff at once on a server, by also add data replication. Like it has been mentioned in the title, the algorithms I come up with are sufficient enough in efficiency for it to be at the acceptable level.
But there could be small things, that I forget to include. Btw, is there way to make it possible to stream data, from cpu core 1 to cpu core 2, quite quickly so I can separate data modifications (workspace environment) and rendering?