Editing /etc/hosts solved my problem.
127.0.1.1 was xxx.brycewhite.com (which wasnt resolving)
By changing this line the slow down of application launching was immediately resolved.
It seems that if you have a 127.0.1.1 that doesnt immediatly resolve (firewall/router/invalid dns entry) then this causes the problem.
Editing /etc/hosts solved my problem.
127.0.1.1 was xxx.brycewhite.com (which wasnt resolving)
By changing this line the slow down of application launching was immediately resolved.
It seems that if you have a 127.0.1.1 that doesnt immediatly resolve (firewall/ router/ invalid dns entry) then this causes the problem.