Very Slow Backend - Version 1.7.8.7

[Cammick]

Having major issues with the slowness of the backend - 

1. Takes around 30 seconds to login into the backend
2. accessing any of the the tabs take around 5 - 10 seconds to load
3. make a change in the backend then affects the frontend - slowing the website access sometimes to a point when it is inaccessible 

Any recommendations?

Here are is the performance tab section.