My AE 2015.3 is taking very long to start up. It gets to the "Initializing MediaCore" message on the splash screen then hangs there for 1-3minutes. It also opens a ton of "Adobe After Effects 2015.3" tasks in the task manager, leaving them running even after I quit the program.
Here's what my task manager looks like right now (no AE running)
So far what I did was:
1. Uninstalled all Adobe software, including the Adobe CC panel
2. Uninstalled any 3rd party plugins, scripts and presets
3. Manually removed all adobe folders - full cleanup
4. Re-installed AE and a few other programs
(all that with rebooting in between).
Apparently, nVidia GeForce drivers were at fault. The WHQL v368.81 break the way Adobe applications communicate with Media Core, rendering After Effects, Premiere and Speed Grade sluggish, leaving extra processes in their wake and messing up certain 3rd party plugins.
Reverting to an earlier nVidia driver solved all the problems.