Hi @Vexod14 ,
Sorry to hear you’re having some problems!
Unfortunately, we can’t conduct technical support over the public forms. This is a process that requires the exchange of sensitive license information as well as detailed technical information from the affected machine.
However, whenever I hear that ZBrush is inexplicably slow to start, the first thing I think is security interference. So you may want to look at your local security to see if it may be actively scanning ZBrush on startup. This can begin happening at any time due to changes in the OS or security program, and can affect different versions of ZBrush differently. This could be a third party security program or Microsoft security (if Windows). You will want to add ZBrush to the exception list for any such security features.
If that does not resolve your issue, you may want to try a full reinstall. It may be the program is suffering from a faulty installation. That procedure involves completely removing any non-standard data or user modifications from the Zbrush environment to see if any of them might be causing the issue, and restoring the program to its default state:
If neither of these are helpful, please do contact Support so we can assist you further.
Thank you!