25 minutes to generate mean 1 or two things, the server dint find your gpu and switched back to cpu or you simply have a under performing pc,i would suggest waiting for the next update as the server and the extension have been updated upgraded and tested on multiple gpu's like rtx 3080, 5090s, A40, H100, A100 also the new extension will have an support ticket system with a log viewer and if you are still having issues i can better assist you there