I noticed that my local wordpress admin area suddenly was extremely slow. After lot of trial and error I finally found the culprit: it was Microsoft Essentials apparently scanning every single request.
The Fix: (source)
Op MSE settings -> excluded processes
And add the following (for every version of Apache/MySql you are running):
wamp/bin/appache/apache[version]/bin/httpd.exe wamp/bin/mysql/mysql[version]/bin/mysqld.exe
That’s it