YouTube recently reached it's one billion user milestone.
Google has upgraded its YouTube's engines to streamline video uploading and its streaming player as part of its efforts to enhance quality for viewers.
According to the FT, YouTube engineering manager, Andy Berkheimer said the recent changes were akin to "full body swap-outs" in technology.
"One of the things we see [changing] is the amount of content coming in that is in HD quality," Berkheimer said.
"It's a feedback cycle - as soon as we started delivering in HD, a lot more people started wanting to give us HD content."
According to the video sharing site, a quarter of its views currently come via mobile devices where connectivity can be particularly erratic.