I have released LiquidTWI2, a lean, high speed I2C LCD Library for Arduino. This library is an extension of the great work done by FalconFour on his LiquidTWI library. Notable additions to LiquidTWI:
LiquidTWI2 also supports the Adafruit I2c Backpack (MCP23008-based) in I2C mode. The library is a drop-in replacement for both the Adafruit LiquidCrystal Library (for the I2C backpack) and the Adafruit RGB LCD Shield Library. By replacing either of Adafruit’s libraries with LiquidTWI2, memory use will decrease, and writing to the LCD will become blazingly fast.
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Excellent timing! I just got my LCD Shield and now have the weekend to learn about I2C.