Re: reducing CPU load
What Apogee Ensemble? Sounds like a Thunderbolt, not Firewire, can you confirm that? What driver version?
What exact AAE error(s) do you get?
Good advice already on testing with all plugin removed and re-checking the systems optimization.
Make sure all your interface drivers, UAD software, other plugins etc. is up to date.
Make sure ignore errors is not checked.
Make sure "dynamic plugin processing" is not checked (YMMV but I generally think this should always be off)
Disk cache is set to a size, say 4GB, not "normal" (which effectively means "off").
Test playing that session using Built In Output as the playback engine.
Try uninstalling all the UAD software. Unplug the UAD hardware. Trash prefs. Reboot. Test.
Create a new Mac administrator account and try testing from that.
(cumulative try to do as many of these things as possible, don't keep undoing things).
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