Dual monitors is the cheapest way to increase your screen real estate. Investing in a 34'' 3440x1440 monitor is the best way.
I find that it's best to invest in great I/O devices rather than in great CPUs. You don't know how much nicer a Cherry MX Blue keyboard makes your typing experience until you use it. A good mouse is also a must. You don't need the greatest gaming mouse; just one with at least four nice-feeling buttons.
I can't believe that I didn't know about application keyboard shortcuts until now. It's too late, though. I'm used to the Windows quick search to launch the application I need. If I press Windows Key, F, Enter, then I'll get Firefox open, since Firefox is the first result that comes up as soon as I press F in the search field.
There are two Windows keyboard shortcuts worth mentioning, in case newbies don't know them:
Alt + Tab: Switch between windows.
Ctrl + Tab: Switch between tabs. This will be really useful for the next version of Windows 10, when Windows Sets are available for everyone.
BTW, macOS really sucks in this regard. Command + Tab switches between applications, not between individual windows. If anyone knows how to change this behavior, I'd be grateful to know.
The recommendation to learn to type at least 80 words per minute is overkill. First things first: buy a good mechanical keyboard. Then learn to leverage it until you're happy about your performance.
Finally, the "use a fingerprint or facial login" and "use a pasword manager" recommendations are indeed useful to work faster, but only if you don't care about security and privacy at all. The more convenient an authentication system is, the less secure it is.