When you ask it something is normal, then it is probably is not. I would suggest to use a profiler (such as dotTrace) to profile which tasks are slow during startup. However it sounds to me that this might have something to do with FindCommerce taking time applying the conventions during start up. Make sure you do not have network or firewall setting that might prevent it from happening 

You can install the developer tools package https://github.com/episerver/DeveloperTools. It contains a view where you can see the initiailization time for the different Initialization Modules and then you hopefully get a better insight in whats causing those long initializations. 

Thanks Quan and Johan. I am going to try out the dev tools to see how long the initialization modules are taking.

Just adding to the previous answers that if you don't want to install anything then you could use the built-in debug views or this post. Only downside in this is that you need to be in the "Administrators" group/role to be able to access the views after addingthe appsettings key. Depending on your authentication setup this might not be an option unless you create a virtual role "Administrators" in virtual roles to map some other role to this role.