i loaded my world in mcedit and found hundreds of the textureless blocks everywhere and when i analyzed them it said they were hidden tile entities from railcraft. is this supposed to happen? and if so why?

this picture is a screenshot of what mcedit has to say after i analyze the block

http://i.imgur.com/wDEEbUV.png

and this is a picture of the spread from this block. i have cleaned the area up a bit for a build

http://i.imgur.com/snU3zQo.png

in short: yes

in long? like seriously why is this happening?

Its fake air, for logic purposes for the player tracking mode of the Trackman's Goggles.

You can make a good argument that it's a lousy implementation of a niche feature and you wouldn't be wrong. However, It's not really that harmful these days and has done wonders for the fake air compatability movement.

The blocks themselves expire after 20 minutes real time.

They can also be safely disabled in the config.

ah ok, so it couldnt be the cause of my lag spikes then?

I wouldn't say they were lag free (one of the points one could make against them). But the only source of lag is micro-chunk rerenders when placing (because bad mojang code) and the number of Tile Entities. Individually they are rather lightweight.

ok then, thanks for the info. ill close this issue now