Big amounts of block events on unloaded chunks cause low TPS

If you schedule a lot of Block events (Pistons and noteblocks) in unloaded chunks, the minecraft server iterates over a list, then creates a new one with unprocessed blocks and after that it dumps it into another list, this juggling betwen lists creates a lot of lag, specially if the list is big.

The code I'm referring to is the next, although the mappings might not be the oficial Minecraft ones:

Using an iterator migh be better I think, if a world showing this is needed i migh be able to provide that in the future, from what ive tested 100k updates on mid hardware reduce the tps to less than 10