Here are a few more things to help make things run smoother.
On the same page, about
:config -->network.http right click and choose New -> Integer --> and call it nglayout.initialpaint.delay --> set value to 0. This tells the browser how long to wait before acting on information received.
To limit RAM:
Go to about
:config --> Filter: browser.cache --> choose browser.cache.disk.capacity --> set to 50000, or try 15000 if you have between 512MB and 1GB RAM.
Reduce RAM when minimized:
Go to about
:config --> right-click anywhere and select New--> Boolean. call it config.trim_on_minimize and choose true. Restart.
Here is the link to these tips plus more Firefox tips (Flock is the same platform as FF) at
Stepcase Lifehack.