Beyond reacting to Cell's attacks (which seemed to be pretty casual ones akin to Tenshithands dodging Gero's lasers) and being able to pull off a Taiyoken before Cell could close the distance, there isn't much to place him any different from his canon self. His one decent hit was an off-guard one, after all, and still didn't knock Cell back anywhere near as much as Piccolo's kick against 50% Freeza.
Treating the Taiyoken usage as an actual speed feat, I guess he could be at least 50% Freeza tier and at most 100% Freeza tier.