I don't know which class of SD card I used, it wasn't the top speed one, but switching to older M.2 SSD connected via USB case was night and day difference. I have RPi4 connected to a TV as a home center with full Raspberry OS because some local TV providers play only in browser. After switching to SSD the OS became snappy and playing video streams (less optimized then youtube) in browser is now non problem.
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