Well actually I am using a 466X UHS MicroSD card with a USB adapter (http://www.amazon.in/Strontium-microsdhc-Memory-without-adapter/dp/B00VMYK3DM?tag=googinhydr18418-21) in a USB 2.0 port. Would that be a problem? The read speed is 70MB/Sec.
I have installed Linux Mint 17.3 with Cinnamon. Everything seems to be good except for Youtube. Playing Youtube via Chrome or Firefox the video is very choppy. The CPU is at 100%. My configuration is: 2 GB DDR2 RAM on a AMD Neo MV-40 64 bit processor http://www.notebookcheck.net/AMD-Athlon-Neo-MV-40-Notebook-Processor.35096.0.html.
Please suggest if there is anything that can be done to improve Youtube playback?