To reduce the amount of CPU in an Originals plugin, you can lower the amount of available voices. Simply navigate to the plugin settings and reduce the voice count from the default 512, to 64 or lower*.
After resetting the voice count, hit save, and this will now save in all current and future instances of the Originals Plugin the changes were applied to.
* Note that you may experience uneven drop outs when you set the library to a voice limit below 64.