I downloaded the portable version of Dragon so I could use it at the library and on school computers but it’s painfully slow. But when I use IE/FF that’s already installed on said computers it’s really fast. The computers aren’t that new I guess but should it be this bad?
I have not seen any noticeably speed difference between the installed or portable versions on the same HDD.
I would suspect the storage device in which you have the portable on is causing the slow down.
Can you try copying the portable version to the HDD of one of the computers, not forgetting to remove it after if necessary?