USE – Ultra Simple EQ by ToguAudioLine.
This EQ “tilts” your sound to be brighter or darker.
The controls are minimal: Frequency, “strength”, bass lift and Q.
It is a simple effect but can be of great use, if your tone is just not right but a normal EQ will not do the trick.
Now this is a one-trick-pony. It is a good trick, but still.
Load is ~0,6% on FX6300. This is generally low, but for just one EQ instance with “one function” this surprisingly high.