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I have a 3GS, Winterboard, 5column springboard, 5 Row, 5 Dock, iRealSMS with qsend and qreply, SBSettings. After respring and 90 seconds im sitting with about 160mb left.
 
I have a 3G S, 16GB

I have SBSettings, Categories, 5-Icon Dock, Kirikae, Backgrounder installed.

After a hard reboot, I am at around 165MB. Usually, that lowers to around 120MB, which is what I usually get after a respring (120-130MB). Have never been below 80MB.
 
After seeing this thread I fired up SBSettings and I was 58 MB. I'm on a 3GS and I've never seen it that low.

Closed out Tweetie via "Processes" in SBSettings and it jumped to 83. Hit "Free Memory" and it went up to 124 which is still lower than most are getting.

I'm running ProSwitcher, SBSettings, FiveIconDock, Reflective Dock, Lockinfo, Winterboard, Transparent Dock, iClassic, No Page Dots and No Docked Icon Labels.

Sound normal?
 
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