and 3-4 transactions per second are just like a joke, because bitcoin is processing about 30 transactions per second at the moment , This may be the main reason of why the whole blockchain is so congestioned at the moment, i know that this is the real reason behind all this thing.
The lightening network has not been implemented yet, because they were going to extend the block sizes and they haven't been changed yet, it is a little bit strange.
But yes, it needs to be changed, what would happen when it reaches 50 per second? it will explode.