No. The updater also patches existing files that are changed, and it does that using an xdelta (differential patching) utility. The DOS screen that pops up does that because it is running a .bat file which executes the filecopy of new files, deletes the executable, copies over the new executable, and then it performs the xdelta patching. Before and after all this, it checksums all the files.
This is not as simple as you think. But it makes the updater much smaller, say the new one is 497 MB. It mightbe twice that without the xdelta patching.
As mentioned, I have never had an actual virus/malware that Windows Defender did not stop. It is actually precisely Bitdefender I use for an occasional scan. It never found anything that Windows didn't stop. Ever. In the past six years or so.
I know that one is cheap but it's one of the very few cheap and honest ones.
You need to check it's CPU usage when it is working on new files, not when it's sleeping.
What Windows does is the same as Chrome (for downloaded files). They halt the files until checked. But the scan does not slow down the system like many other tools do.
PS: Designing games or working with graphics does not make you a computer specialist. At all. This is coming from someone who worked with computers since the early 90's, and also have had his own IT support company for years.
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. it can ramp ofc (up to 26% or more if allowed to speed up the process), but never to an extend that the pc cant be used. you can always specify, if your pc is a potato, when you wanna do an actual system scan so you wont slow down during the work. not that you gotta do a frigging system scan ervery fucking day, but you do you i guess.
