[PD] Maximizing Efficiency

[William Fields]

Does anyone have any guidelines, recommendations, or rules of thumb for
maximizing efficiency within PD?

For example:
Which operations/objects/externals/GUI elements are most efficient and which
are most costly?
Is it extra costly to introduce an object that listens for input like
keyname, midiin?
Is using graph-on-parent costly?
Are colors costly?
Are there any general strategies that you use for keeping things fast and
efficient?

Also, on a somewhat related note:
Under which operating system does PD run the fastest (for a given hardware
configuration)?

Thanks,
-Bill