Packaged visis running slow normally means a machine too low on available cpu resources to keep up with target framerate. When frame rate drops it does so unsteadily, jerkily, rather than to a steady lower rate.
Video output method can also affect frame rate, ie standard vs direct draw. To check this, right click the visi window, Visualisation studio, tools, options, draw method.
I've no idea of your hardware, software setup, nor level of computer knowledge, some much of the following might be irrelevant, I'll just cover most bases:
Whats your os/cpu/ram specs?
Have you eliminated the junk software that sits in the background eating resources, and is so common on computers?
Have you tried reducing visi window resolution? Right click the visi window, isplay quality, select something lower.
When all else has not been enough, use a smaller visi window or reduce PC's video resolution setting.
For a bit of perspective on what you ought to be seeing, I got 23-30fps on a 433MHz celery CPU with a small window on hi res, so any decent machine should be able to give you full speed, if set up suitably. But if not, as is often the case, all bets are off.
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