FOUND A WAY TO SPEED UP SIGNIFICANTLY!!!!!! RAM NEVER DROPS BELOW 90 MB!
Use Google to figure out any step you don't know how to do (especially for steps 1 & 2).
Step 1: Jailbreak 5.1 tethered or downgrade and jailbreak 5.0.1 untethered (5.0.1 is the preferable option)
Step 2: Install WidgetTask (optional) and Springtomize 2 (costs $3, but most of you will probably pirate it) from Cydia.
Step 3: Go into Springtomize 2 > Capabilities and turn "Custom Capabilities" on
Step 4: Turn all switches on except "Mulititasking"
Step 5: Go to Settings>Notifications>WidgetTask (at the very bottom) and turn on the "In Notification Center" switch.
Step 6: Respring.
Now multitasking will be disabled and your RAM will skyrocket. If you want to see the multitasking bar, swipe down notification center and it will be there in a widget. All of your recent apps will be there as normal, except that they will just not be running in the background.