Providing that what I've read in this article is true I'm wondering why it's faster to run Raspberry Pi 4b from microSD, than it is to run it from a decent speed (200MB/s read) USB Flash Drive?
Is the above statement true at all? I mean do you agree with the results outlined in this article - above all with the statement that an operating system run from microSD card will be faster than one run from USB flash drive?
It confuses me because I know that modern USB flash drives connected to the USB 3.0 port have around 100MB/s real life sustained read/transfer speeds, compared to 50MB/s real life sustained, class V30 microSD cards, read speed.
I also read this article but for unknown reasons, there's no real life read speeds provided for these microSD cards.
Currently, I have Samsung Bar Plus 256GB (around 150MB/s real-life read speed) and Lexar PLAY 256GB microSDXC UHS-I R150 (around 100MB/s declared real-life read speed) and I'd like you to advise me which of these will give me better performance while watching hi-res youtube videos and 1920x1080, H.265/HEVC movies? I will use VLC player to watch these HD movies.
I've also read that the microSD card reader installed on Raspberry Pi 4b has only 50MB/s max transfer speed, so even if microSD card can go faster, it bottlenecks on the reader. Is that true?