UniFab is significantly slower to convert than the converter from DVDFab12. An m2ts 4K UHD with HDR 55Gb in size with DVDFab 12 to MKV4KHDR265 with 10Gb about 11 minutes. The same with UniFab about 16 minutes. What is the process after conversion? What happens there? Will definitely stick with DVDFab12. Everything in one program and you can start converting. I would have liked that in DVDFab13 without having to switch to UniFab in the process.