When i play snapshot 14w28b it fails to update the chunks after it initial game starts. This is noticeable when you walk in a direction. you see some details but. You don't see the land being redrawn . It appears to be transparent. Also the game crashes after awhile after this error occurs. going into resource packs but not changing the pack and then going back to the game makes it draw the land where you are at again. but the crash will hit awhile after that. the crash shows up in the launcher.

I don't know if you are aware of this crash but it makes 14w28b unplayable for me. version 1.7.10 works just fine with redraws and speed. I also noticed that 14w28b is a bit laggy compared to 1.7.10 release.