This video gives many useful hints for improving your CPU performance and the needed background information...
Nevertheless these are basic approximations... in reality it works even more detailed and complex... but should be enough to get some insight into the process.
I learned really a lot by doing the researches for this video and I hope it will be helpful for you!
Links to the mentioned videos:
PPQ and CPU 1: • FL Studio: PPQ and CPU...Part 1
PPQ and CPU 2: • FL Studio: PPQ and CPU ...Part 2
5 Guidelines for TS 1: • 5 Guidlines for Timestretching in FL ...
5 Guidelines for TS 2: • 5 Guidelines for Timestretching in FL...
Please let me know what you think in the comments...