One of things I love about windows 10 is how fast it is. I am not sure what you mean about bloatware slowing down your computer. It's not windows 7, where every update makes it slower. True, Windows 10's updates are a royal pain in a butt, but once the update is done, its fine. Any bloatware you have on your computer is something the manufacturer put on on it, or you accidentally installed it by downloading a free program, or install Adobe plugins and not unchecking the bundled bloatware (SHAME ON ADOBE!)
Speaken of which, I just upgraded my two home office and work office PC to 1909, and I noticed boot-up is actually much faster. before it was fast, but now its just a few seconds. Doing a cold restart is still much faster than windows 7.
Now, I am not sure if you are an IT person, but the first rule of owning a Windows PC is do a clean install of Windows as soon as you open the box and register the computer online (to activate the windows). This will get rid of all the bloatware every major Computer manufacture is paid to put on your computers. McAfee or Norton is the #1 app that slows down a PC and makes it unstable, and just about every computer I ever bought came with it installed. Simply uninstalling it won't fix the problem (in some cases it causes the computer to become more unstable. I have lots of experience with that). You also don't need the "Tools" that HP, Lenovo, and other brands put on your computer. They are just annoying, take up resources, and don't do anything for you that windows update doesn't already do.
Create a USB installation disk (Download the tool from Microsoft). Installation is pretty quick and straight forward. Google how to get your computer to boot off a usb disk (every computer is different how to do so). You also may want to know what model number the PC is before starting. There are rare occasions where your computer may have something Windows 10 does not recognize and you will have to download the drivers from the manufacturers website. Always make sure you download the drivers from manufacturers website. Driver downloads is a great way to completely mess up your PC with malware, viruses, etc if you download it from somewhere else. And never ever ever ever download a program to "keep your drivers updated" Once again, bloatware at least, malware at most. And this is something Windows Update does for you anyway.
Make sure you not on the internet when you do your reinstall or it forces you to use an Microsoft Account to log in (use a local account, and then tie in your Microsoft account later if you have one).
Now that you removed McAfee or Norton, what antivirus should you use? Well, the built in Antivirus is adequate for most users, but if you want something out there that does a little more, Avast and Avg (same company) are excellent choices for both the free and the paid versions. Make sure you only use their antivirus programs. Their other "PC Performance" and "Driver Update" programs are undesirable.
One other final Note, performance of your computer depends on several factors. Biggest one is CPU, followed by Storage, Followed by Memory.
For CPU, you want at least a Intel i5 or Amd Ryzen. Celerons, Pentium, and i3 are pretty much junk imo. AMD A series is garbage performance wise).
Second Critical Factor is Storage. Hard drives are SLOW, especially if its a 5400 rpm. 7200 rpm is what you need to have when using a conventional hard drive. SSD's are becoming a lot more popular, more reliable, and cheaper. A Sata SSD replacing a convention hard drive is like night and day, especially when you log in after a major update. If your mobo using a M2 pci express SSD is the faster choice. Make sure you BACKUP your data regularly. While this rule applies for conventional drives as well, usually when a SSD fails, it doesn't give you any warnings first.
Finally Memory. The "sweet spot" of memory to have is 8 Gigs. You really don't need more than this unless you are doing heavy graphical work, gaming, or like to do virtualization. Also, make sure your computer uses at least 2 memory sticks. For example, 2 8GB sticks is faster than a single 16 GB stick of ram, since only 1 stick cant take advantage of dual channel memory.
My Home office computer is a 3rd Gen i5 with 8 gigs of ram and a 480 GB sata SSD, and my Work Office PC I am sporting a 6th Gen i7 16 gigs of ram and a 1TB M2 SSD. Both computer's are lightning fast with Windows 10.
