It's less about the speed and more about the fact that it doesn't really add anything to the website. It's basically saying "Hey look we make stuff for these", which can be accomplished with much less. Take a look at iA Writer's website:
Notice how simply they display the product without any fancy animations? Like you said before: you're a start up, you don't have much budget. So why are you spending your time developing animated slide shows for your website when a simple image accomplishes the same thing?
At the end of the day it's your website and you'll do what you want, just make sure that your allocating your resources to things that actually matter to your customers and not what makes you feel good.