As one of Vuo's developers, I work on Vuo's engine (the thing that makes compositions run), work on nodes, and write documentation. You'll see me on the forums answering people's questions about Vuo.
I've been developing apps and frameworks for several years (since I was in college). Pre-Vuo projects include Kineme Quartz Composer plugins, iOS apps for education, an app that analyzes photographs of tomato slices, and software to help people with disabilities use talking keyboards.
I enjoy using Vuo to make live music visuals. My hope for Vuo is that it will grow into a community of people of diverse backgrounds and identities making lots of different artistic, useful, unique, goofy, beautiful, crafty, wonderful compositions.
Yeah, your idea that maybe your barcode is being identified as the wrong kind of barcode sounds plausible. And adding the option to select the type of barcode (or to have it auto-detect, as it does now) sounds like a good fix, as well as a possible performance speedup.
Aha, looks like the issue is not graphics slowness, but a side effect of the way that Make Text Layer renders sharp text.
Make Text Layer snaps the text to pixels so that it's totally sharp rather than blurred across pixels. However, as your composition points out, this can interact weirdly with scrolling text across the window. To keep the text sharp, Make Text Layer causes the text to jump from one pixel to the next. Depending on how the scrolling events line up in time with pixels in space, the text could actually move 1px or 2px or 0px on a given display refresh. Hence the jerky motion.
If you remove Make Text Layer and just use Make Text Image — which, when combined with Make Image Layer non-realsize, does not snap to pixels — that should be smoother. With the attached composition, if you slow down the scrollers and zoom in, you can see the pixels gradually fade in and out as it moves along.