Yep.
Figure that out already, so I try not to install or activate too many.
I wish there was some kind of list to show how much memory is being used on these tweaks.
And I don't mean those endless applications that shows you the amount of memory per application (like AppInfo).
On my iPad-1, with zero application waiting in the background (After activating RemoveBG) I have only 88 MB left, out of the official 250MB that comes with the iPAD-1. ( people with iPAD2 - are probably shocked by that number...


)
Point is I must have what I think is running all the time in the background :
[*]5 raw keyboard[*]Manual spellong check[*]MultiTaskingGustures[*]PageNames[*]ManualCorrect[*]Action Menu[*]Activator[*]CyDelete[*]RetinaPad[*]Springtomize[*]WinterBoard[*]Unrestrictor[*]Action Menu
P.S
An Advice.
Before installing and running a new Tweak.
Clear the memory (with the likes of "RemoveBG")
Take a look at the amount of free RAM memory - Take a note
Install and Re-Check to see how much it takes now (after clearing memory).