Game takes a while to boot as its doing extra stuff, same with the reset on exit..
Its because the 3ds has to reboot into extra memory mode for this game. Its sets the Configmem-APPMEMTYPE flag to 3
So when you exit it drops back to the default value of 0 and has to reset to do it
Values of 6 and 7 added to latest firmware will be for New-3DS no doubt
Why do you think it is possible to skip the softreset by opening another app/game instead of just closing Smash? Does that help in the process or could it be an overlook on Nintendo's part that will get "fixed"?