There were a couple that had No File Found errors which means the system spends time looking for something that is not there anymore.
TFC cleans up temp files, internet cache and history which can slow system and internet down.
Defrag straightens the files on the hd up so that the system can access them faster.
Look at it like waking up in the morning and all your clothes are in one place and ready to be put on. You get dressed faster and move on with your day. If you had to look in a closest, a dresser and maybe in another room for your clothes it takes more time to get ready.