despite some other opinions I tested performance from the beginning of the Elementor-hype and for me WPBakery has always been the lighter solution. It depends though a lot on how theme authors implement everything. I just had to check a theme for a client, that is all the rage an TF, but after just 5min of testing I have to say, that it’s WPBakery implementation is a nightmare. Greatives has one of the best implementations I knew. It is reliable and fast.