Dock using 100% CPU and lot of VM after El Capitan update

MBP early 2011, upgraded to 10.11 El Capitan from Yosemite.

Since the update Dock is using 100% CPU and great amount of Virtual Memory, can reach 40gb in 1 hour and growing.

These steps tried so far:

1) deleted ~/Library/Preferences/com.apple.Dock.plist

2) deleted ALL the files in ~/Library/Preferences

3) removed ALL the files in ~/Library/LaunchAgents

5) deleted files in /library/Application Support/Dock

6) removed parallels, vmware, virtualbox

7) reinstalled 10.11

8) created new user with admin privileges: no problem for this user

9) disabled time machine

10) disabled spotlight

Restarted many times between these steps.

Force quitting the Dock stops the CPU and Memory usage for a minute, then it go increasing again.

Using the command

sudo opensnoop -n Dock

I get a list of files processed by dock, always the same files (mostly apps in the /applications folder) and it stops at /System/Library/Fonts/SFNSDisplay-Medium.otf

Don't know what to do next.. I would really like to keep my user account..