Bro this plant has way more problems than just cup size. The first set of leaves, the first blade that came out is deformed as hell. Then it looks like the whole plant fell outta the ugly tree and broke every branch with its face on the way down. Just kiddin, its not that bad. But its probably not your only plant either. I gaurentee thats not your best looking one and I bet her sisters looked better than she did cause she got a rough start by the look of her.
Have you guys ever tried taking youngins from packed under the floros and tossing them straight under a MH or hps? Cause when i do it, they look like new plants in three days, even in the same container.
If we were all sitting around a table id bet 20 bucks (to everyone here whos says rootbound) that hes not root bound. And youll see if he pulls that plant outta that cup and snaps a picture. My last run i bought some plants that were two feet high in cups. They were root bound. The roots had brown on them at the bottom of the cup. And they still took right off after a transplant and some hid lighting. I agree its time to transplant, but i just cant see that little thing being rootbound, or choking, unless you guys have a different definition of rootbound than me. To me a couple roots circling the cup doesnt qualify as rootbound....
Pssst..hey OP, show us your roots