I had this with my old computer, when in lauching tekkit classic on the tekkit laucher, press options and try the oldest build. If this doesn't work then your computer may not be fast enough. What computer is it your using?
1. Thats weird, A LINK TO GOOGLE SEARCH "SAFARI"........ Don't know what happened there. 2.If you wanted to spawn stuff in then you have to CHEAT where as using the safari net saves you having to cheat.
A safari net because you always have to spawn mobs or animals in, in tekkit classic. Where as if you had it in tekkit classic you wouldn't have to cheat all the time. Also barrels too.