8+ has better multi-core management. Hence it is faster.
Boot faster: not an issue. Booting speed is not indicative of running performance. Once windows is booted it does little OS access, other than managing the pagefile, which should ALWAYS be set to system managed.
I have configured dozens of w8+ computers for clients, and family members. Rarely are the START-WALLs seen by anyone, other than during initial logon to click the DESKTOP tile.
Once installed:
install adobe reader and select it to be the default for PDF files
and then disable the auto update service
select the windows media player as default
select the windows image util as the default
And then: disable ALL live tiles.
set windows updates to never check. Only manual: install hardware updates separately.
Review the scheduled tasks to disable ALL user experience stuff, and auto utils such as defrag,...
After installing drivers make sure NONE of them auto-check for updates: such as AMD CCC,...
And: disable ALL AMD services and startup options, if using any AMD bits.
And then: check ALL the services and startup options.
Use MSCONFIG, click the HIDE ALL MS services, to show other items.
Disable most of them: Only one I have enabled it Logitech blue-toot service.
Google, NI hardware,... are all disabled.
MS services: Disable MS media player sharing service (what is the point of this?)
Taskbar: set to NEVER combine, and to SHOW ALL for the notification area.
Do NOT select to boot directly to the desktop. Any settings, such as removing the idiotic shadow for icons and fonts on the desktop, will not be honored.
Learn how to add shortcuts to the taskbar, and the desktop. Then create folders on the desktop for all the various tools: audio tools, audio programs, windows tools,....
Have ONLY the most often used shortcuts on the desktop.
NEVER NEVER NEVER save ANY programs, or files, to the desktop.
The desktop should be clean and quick. (I have clients who save EVERYTHING to the desktop and now cannot find anything.)
The desktop is not always included in backup software default settings.
Learn all the w8 desktop screen mouse positions and quick clicks.