Done Textures

So I decided to open up regrowth and give it a go today, but when I logged in I was greated with nothing but all white textures, with some insane lag, I don't know if anyone else has had this problem first starting playing the pack, The only modifications I have made to the pack is adding optifine.
Here is what it looks like
Gyazo - 4ddf8917be24af7d3068b4fcb269cca4.png

 

greeted* (happy mikey?)

 

Reinstall the pack or remove texture pack .

 

ok, thanks