Thank you James. Yes, I use Bluehost shared server.
I can see how loading times of the site can differ this way.
Can this also explain the drastically different results in the Pagespeed Score & YSlow score? F.e. Gtmetrix detecting more or less external Javascript scripts when you test the site a second time?
How much better would the site perform when I upgrade it to a private VPS-hosting?
Thank you!