I have been suffering from slow Firefox maximizing, so I did some long and painstaking research (i.e. a bit of googling) and found a tweak.
Go to
about:config (by writing about:config in the location bar) and right-click on any line and select
New > Boolean. As name put
config.trim_on_minimize. As value put
False.
Firefox gives away most of the RAM it uses you minimize it. This will make it keep the RAM and thus speed up maximizing. Firefox will still give the RAM when Windows ask for it.
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