Only problem with shuffle the pragmatic slots were laggy and slow but other then that very nice casino.
I having these experiences before, not only on (SHUFFLE) but on different casinos.
It's because of your browser, try to update your browser first. If these not working, try to setting > go to system > checklist use graphic acceleration. It's work for me for second step using (Grapich Acceleration), I had a slow or lag situation on slot pragmatic for several months.
Once use those, the lagging is gone.