To improve the CPU usage of SIGNAL, please try the following:

1. Increase your buffer size to at least 512 samples.
2. Minimize the release time of volume envelopes wherever possible.
3. Minimize the use of time based effects on the Global and Pulse Engine levels.
4. Reduce the max number of voices used by a Pulse Engine (click the gear icon on the top right corner of either Pulse Engine A or B).
5. Minimize SIGNAL's GUI within Kontakt when it's not being used, then close the Kontakt GUI.

We also recommend running your DAW in 64-bit.