[TYPO3] RealURL question - best fix?

[Edwin Blokker]

I've been getting postVarSet errors when I'm NOT logged in the BE and 
when trying to visit pages deep in the page tree. Today, I found out 
that adding:

'disablePathCache' => '1',

to my realurl config seems to solve the problem. However, I found out 
that instead of adding 'disablePathCache, adding:

'firstHitPathCache' =>'1',

Also seems to solve the problem. My question is, which one of these is 
best to go with as a fix? Performance wise maybe?

Thanks,
Edwin.