I am just a beginner at this type of stuff, but, how many cores does your CPU have (goto task manager)? If multiple, are all of them being used when rendering? Some effects are multi-core effects and some are not, it depends on what you use, but for me, to use all of them and achieve faster rendering, open After Effcts and go to Preferences, or [Ctrl + Alt + ;], then ‘Memory & Multiprocessing’, check ‘Render Multiple Frames Simultaneously’, set ‘CPUs reserved for other applications’ to ‘0’ and ‘RAM allocation per background CPU’ to anything you have available. Higher values, equal faster render time. Hope this helped!