Is it possible to "preload"(actually not preload, but kinda emulate the startup) e.g. nautilus (or firefox) startup at login, so the first time I launch it myself it launches faster? Probably to start it on another desktop and close after some seconds?
install the preload package
with a console type :
And that's it. THe package will preload the applications the most used applications after calculating the usage statistic.
preload an application use ram memory and behave differently than "cold" or "warm" start an application.
The Cold Start impact is due to the hard drive speed and latency. You can purchase a good SSD drive in order to speed up cold start (it has a real overall impact on the latency of the system)