LTC was designed to be GPU-hostile, which meant that it would be more efficient to mine on a CPU. This was the entire purpose of the currency, however it was discovered months later that it wasn't GPU-hostlile and GPU mining is more efficient than CPU. A lot of people have accused the Litecoin developers of GPU mining LTC since day one with the plan of doing a pump-and-dump. It is also strange as originally LTC was supposed to use Bcrypt as its hashing algorithm which should make it GPU-hostile, but this was later changed to scrypt, which isn't GPU-hostile at all.