Why don't you overwrite the tags with the information from the Convert process? That would save you one step.
And concerning the reading speed: this is hardly an MP3tag problem. Get yourself some decent hardware and it will be over in minutes. Even from an external HDD (USB3.0) 8000 files should take no more than 2 minutes.
I have fast 7200 rpm hardrives, it's just a lot of files.
I wasn't suggesting it was a mp3tag problem, just was looking for a way to reduce the steps.
The reason I need to do them as separate operations is because the files contain incorrect tag data when I get them. There is no way to trust what is in all the tags, and I only need to save the artist and title (which I can accurately get from the name of the file, which is always artist - title.mp3)
Before I can share with friends or family I need to be confident all the other tag data has been removed. Offensive names in random tags, and pornagraphic cover images are usually the biggest culprits.