SSL stands for secure socket layer, which means approximately „protected single connection“. Contrary to a normal connection, whereby your data will transfer over an unknown route (way of the slightest resistance), wird hier a one by one -connection between your computer and the server is deployed here. This applies to all operations; when sending also as when receiving. So you have the guarantee that the transmissions cannot become „copied“ by other computers. But even then the data transfer does become hardly or nearly unnoticable slower.