Apache 2.4 is running very slow or hangs

I have migrated from XAMPP (which hasn't x64 version) to WAMP (Win x64 version), after run the services several times I found my apache suddenly running very slow and hangs. I don't know exactly what have done. Now, it solved! I find this from google:

Fix:
Add this configuration snippet to Apache24/conf/httpd.conf (bottom of file seems fine):
AcceptFilter http none
AcceptFilter https none

And restart all services. Done! Hope this help.