At first I thought it was Segwit's fault, because in the same wallet I have this - normal wallet. But this should not be a problem, because I sent from the normal address created in Electrum.
Nevermind. I think I should wait about 24h and then I will worry. Now when it comes to acceleration, it can be done only by a miner connected to the pool.
Anyway, a good lesson for the future, not to choose the lowest fees
