In FL Studio you can monitor the plugin performance.
It monitors all plugins and displays how much they use the CPU.
Great tool if you want to know which plugins use a lot of CPU.
From the manual:
Columns:
% - Audio buffer percentage required to process the plugin. See CPU Panel for a detailed explanation of this value.
Time - The most recently recorded processing time measurement for the plugin (not all plugins are active all the time). The value is processor time per-second.
Peak - The highest processing time measured.
Total - Sum of all time measurements for this plugin. This allows you to compare processing across whole projects.
See the attachment for a track i'm currently working on.

