I tried. I really did. But I returned the Chromebook.
It was a lot of little things. The SD card stuck out of the SD slot, the hinge was ugly, the keyboard mapping was odd, the touchpad was numb, overall it was slow, the updates to Chrome OS were behind, the Chrome extensions were backlevel, yada yada.
Besides the sluggishness in YouTube it was also slow updating Google Docs. I have a large Google Document that updates on the T420s in seconds. It updates on the X40 almost as quick but on the Chromebook it consistently took 20 seconds to update.
The price was great but the function was unsatisfactory.