We cannot help you without the information that Daniel asked for: the diagnostic report and a project that is slow for you. Dorico has to do a huge amount of calculation - probably an order of magnitude more than older generation applications - in order to do the complex processing for collision avoidance, condensing and all the other features that are intended to reduce the amount of time the user has to spend tidying up the score. So it’s not particularly meaningful to compare the performance of Dorico with other applications.
However, we would usually expect performance on a moderate size score to be much better than you are reporting (there are many users who are editing larger scores without problems), so this suggest that there’s a specific problem with either your system or your project. There are number of known issues that we may spot straight away, or there may be some new performance problem that we haven’t yet encountered. We’re unable to tell without the project and the diagnostics.