Usually, the ethereum chain can be processing up to 40 tx in a second, But the massive demand caused by ico that bring the chain thousands transaction in a second.

What do you mean about "controlled by developer"?

Are you nuts?
https://np.reddit.com/r/ethtrader/comments/6imwi2/dwarfpool_and_f2pool_are_damaging_ethereum_a/

In another case, There is a glitch with the fucking gdax exchange. This already did by bitcoin in the past time.

I remember the bitcoin goes below $1.