I'm talking about simply opening you tablet via Windows Explorer, right clicking (if your mouse has right handed options), then hovering your mouse onte the "New" option, and then selecting the "Folder" option in the new submenu. Then you type a name for the new folder and press enter, and the window stops responding for a long time, if I force close it, the folder was created under the name "New Folder", if I wait ages until it finishes, then it does what it should do. Oh, and it happens both on creating under SD Card or internal memory, doesn't matter.
Meanwhile, on my Xperia Z1, and on my previous Nexus 4, ASUS Transformer Infinity and Motorola Xoom, it was always fast, a little slower than creating on a pendrive, I understand how Android's MTP works, but it's so damn slow on this Galaxy that I'm pretty sure it's is "touchwiz bull****"
File transfering is also quite slower when I compare my Xperia and Galaxy 10.1, considering both have the same speed on SD Card (though the brands are different, Galaxy having a Sandisk, and Xperia having a PNY), I transfer a lot of videos (That's why I needed 64GB, like all my previous tablets), so I'm used to waiting, but damn hell, it's slow. One day I thought about transferring some of the to the Xperia, and it was so faster that I'm pretty worried, I bought a Note because of the pen, and I'm not sure if the current few custom ROMs have all the support and functionality, but if I got to confirm it, I would change it right now!
But I admit upgrading it to Kitkat made it a little bit faster, so instead of "waiting ages", I should say "waiting years" now.