What makes you think that? I haven’t noticed any “slowdown” when using them on 45Mpx images.
- If you are using ClearView, you are using an old tool that has been surpassed by the fine contrast sliders.
- You are using straight contrast and selective tonality - there are better ways of getting better results.
Send me a file or a link to a share and I will work it through for you and return the DOP so that you can see what tools I used.