I would venture to guess that you are comparing TC to traditionally hard drive installed systems.
You don't state which of many modes of operation that you are using (see Getting Started).
TC's design goal is to be nomadic and not a traditionally installed OS.
Not only are these other modes of operation available but many other "tuning options" including.
1. Using the optional/ directory
2. PPI mode, i.e., tclocal,( persistent /usr/local/) where all extensions are "installed" and not loading upon each boot.
3. Persistent /home.
4. Persistent /opt
Any combination of the above, as well as combining extension into a personal "collection" as per Jason's post.
I had been suggesting that we offer "collections" but that would mean even more effort to update.
If you wish booting to a pristine state, being nomadic is not important, you can use any combination of the above to completely eliminate the backup/restore requirement and loading upon boot.
You can, as some have already, perform a "traditional hard drive installation".
So really, to be fair, TC should be listed at a minimum of 5 times showing boot times for all the capabilities and choices that TC supports and allows.