First I saw this tip, but
sleep 20;xscreensaver -nosplash seems not to work anymore on Ubuntu 14.04.
So I coded this script
execLater.sh and put it at a place in my $PATH,
root:root and mode permissions
rwxr-xr-x, and put it on a fully
root:root folder structure like
So it sleeps before executing the command.
Show all hidden startup applications by following this tip
Now for each startup application.
If there is, for example, this:
change to this below, where "20" is the delay; I used up to "60" knowing I dont care much for some applications; and a minimum of "5" for the ones I care most.
execLater.sh 20 xscreensaver -nosplash
The tricky part
each of these below must have an exclusive delay of "1" because everything else depends on them
/usr/bin/gnome-keyring-daemon --start --components=secrets
/usr/bin/gnome-keyring-daemon --start --components=pkcs11
/usr/bin/gnome-keyring-daemon --start --components=gpg
/usr/bin/gnome-keyring-daemon --start --components=ssh
My guess is, when all 60 apps startup at same time, these above take longer to complete and so the whole desktop stays unavailable...
If you log when each command was executed, you will understand what applications must have delay of "1", because all others are "actually only executed (?)" or "called?" after these; the above list is not fixed, it is just a tip, just logoff and login (no need to reboot to complete this list) so you can make the tests until you are satisfied with the results - now my desktop is available after only 5 seconds :)