Opening the full version can also be a bit slow. I just timed it and it took 25 seconds. However, once it is open, all the other commands are executed very quickly -- though sometimes that will depend on the nature of the operation: the format involved and the filters applied etc.
The trial version is severely crippled in a number of aspects which IMHO was a very silly decision by Corel, though apparently driven by monetary concerns. They have stripped out all but the basic codecs to avoid having to pay licence fees for a free trial version. And to keep download size small they have stripped out a number of other basic features. So many potential users don't actually get to trial particular aspects of the program which might be of special interest to them.