We all remember the early days of tekkit. High lag, crashes, bugs, missing chunks etc. But i will admit that for the most part the FTB server is holding up quite well even with some of the more laggy items being left open to use. The only things i've noticed to cause lag so far are high amounts of wisps and the creation of other worl linking books. But that's only for a second.
There was one instance however. a few days ago when it was just myself, squippit ans Techmav on. There was a high amount of lag to the point of chests opening about 4 minutes after i warped away from the area where the chests were. Rather disconcerting considering i was trying to open my diamond chest and suddenly found it to be a lot smaller and filled with junk
To sum things up however. Good work Broo, the server seems very stable even with all the new added mobs and biomes.
Draze's Vanilla/FTB/Tekkit comparrison score out of 10 for fun/stability etc: 5/6/9