Our subscribed streaming channels which run without a problem on our computer are extremely slow and very hard to use on the Roku TV. The software is up-to-date, version 13.1.4 build 1510-48. I just checked for an update and there is none.
Britbox and Disney are both almost unusable with their lag in response to the Roku remote controls. Acorn TV, which was always fast response now seems to have a slower response to the remote control, compared to what it used to be. I don't know whether the problem is with the performance of the paid streaming apps on our Roku TV but it is not with the platforms/channels themselves because they run smoothly and without lag on our computer (which is on the same wireless network as the Roku TV.)
The cable TV channels we subscribe to run/respond on the Roku TV without lags/problems. (Once we have selected TV channels from the home menu, a different remote controller from the TV service provider is used, not the Roku remote control.)