Yes, when I choose Export Project, and the bar of "Exporting project" is loading, in the state bar appear "Recompressing xxxxx.png" (xxxx.png is every sprite that I used in animations). I was waiting for half hour then I closed Construct 2 because was very slow (Before R76 were two or three minutes).
I repeat the process with brute PNG compression and it was as slow as standard. But in None PNG compression was very fast (Less than one minute).
My project has more than 200 small sprites in PNG format (15 sprites in some animations)
I make a new project with 30 sprites in an animation, and I had the same problem.
Edit: I tried with construct 2 examples and I have this problem too.