When I have driven on the motorway I have not been conscious of a lack of acceleration, and indeed one day I looked down to see the number 92 on the driver's screen. I resolved to set the ACC on the motorway to avoid doing that again. I wasn't flooring it though, because I wasn't in a hurry - it just sort of crept up to that as I moved with the traffic, without me actually having tried to get to that speed.
More relevant is an experience I had on a long straight stretch of single carriageway road earlier this month. I pulled out to overtake a slower car, and the MG4 shot ahead in its usual nippy manner. I saw another slowcoach ahead of the first one and decided to overtake it too. I was already going pretty fast, but asked for a bit more. At that point I noticed that the car didn't quite have what my late lamented GTi had in the same circumstances. But this is a comparison with a GTi, for goodness sake. In terms of completing the manoeuvre there was enough power there and it wasn't an issue. I wouldn't have described the acceleration as very slow, and there was no sense that I wasn't going to make it.
It's just possible that this might be a relatively minor manifestation of the power loss issue discussed in another thread, as Diggsy suggested. Bowfer thought his problem was worse in cold weather, so if it is that, it might deteriorate. We've also had a new member with what sounds like the same issue in a January 2023 car.
Is yours an SE SR? That seems to be the model the problem has manifested in.
