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Well my live shop is still running PS 1.6 but I have a test shop with TB. 

Yes, we are running a VPS with 3 CPUs and 8GB of ram. It's not slow but Its not especially fast either. We are also running Apache, not Nginx.

Just compared the TB shops that shows up under menu "Shops using TB" and your shop is one of the fastest. The fastest one for me is this one  https://www.add-one.fr/ I think its a big difference between different shops in speed.

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@wakabayashi are you using any other teqniques or modules for pagespeed and what server setup do you have?

 

I think your site is pretty fast and not all Thirtybees shops are so there must definitely be a difference in setting the shop up.