What boggles my mind is how slow the Win 10 start menu can be. Unless you disable the web integration via regedit, it can take _seconds_ to open something as simple as the calculator. Plenty of times I'm tapping my fingers for something that would have been instant in XP.
This makes Win 10 so much more pleasant for me:
[HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Windows\Explorer]
"DisableSearchBoxSuggestions"=dword:00000001