BrainDestructionByCode I

BrainDestructionByCode I is an esoteric language designed to drive the programmer insane, created by threesodas.

Cells of BDBCI

BDBCI is a cell based programming language, similar to brainfuck. It has a finite amount of cells (20,000), and each cell's numeric value can be used to execute ASCII code.
Every time a character is read by an interpreter, every value is shifted one cell to the right. This includes the very first character. So, cells will end up looking like this:

Code:
++
Cells:
002

NOTE: All cells are always shifted BEFORE an action is executed by the interpreter.*
Code must be optimized to fit this challenge.

Valid Characters

The following is a list of BDBCI characters and their respective actions.

Character	Action
+	Increment a cell by one
-	Decrement a cell by one
>	Shift one cell to the right
<	Shift one cell to the left
»	Shift two cells to the right
«	Shift two cells to the left
⇥	Shift three cells to the right
⇤	Shift three cells to the left
[	Create a loop
]	End a loop on the condition that the current cell value is zero
r	Shift all cell values left until the first cell is a value other than zero
.	Print the ASCII value of the current cell value
,	Set the current cell to the ASCII value of a user's input character

*The r character is the ONLY exception when it comes to actions that shift cell values. Cell values never shift when this character is executed.