What happened? I'm operating at a crippling speed with an 8 - 10 second delay for almost every action. Even in AE CC 2014. How do I fix this issue?
An install of CC 2015 shouldn't affect existing or future installs of CC 2014.
So, IF it did cause the slowness issue, something is unique about your situation, so we'll need more information.
And, if it didn't cause the slowness issue, something else is causing it, so we'll need more information.
I know it sounds weird, but turning off the WI-FI solved the problem for me! I'm trying to find out the exact reason but for now it's the only solution I found...
Here's the thread I opened on a similar issue Cineware Plugin Abnormally Slow - After Effects CC 2015