We are thinking about using your product, but feel that the mobile products are a bit slow. Is the paid version of the product any faster?

There is no speed difference between the Free Trial and paid plans of BrowserStack.

In addition to the physical smartphones and tablets we provide, we also have official simulators by Apple for iOS devices, and official emulators for Android and Windows Phone. The simulators/emulators are inherently slow, and we have optimized our remote machines to work faster.