Right, let's just get down the facts. Anything above 3s it is quoted you lose 40% of your visitors which means you either need to put in 40% more effort (time) or accept 40% less revenue. Actually it doesn't work that way and is worse but that's for another discussion. The cheaper the host the slower the performace, the worse their reputation for Google, and the higher the visitor and cart abandonment. So Siteground will be at the low end and the high end you have cluster hosts. It all comes down to how much you value your time, unfortunately most don't so they will by default gravitate to the cheaper hosting companies. Is it right, is it wrong, it works for them however it means they need to work harder for less these days, it's zero sum game in the end but some like doing it this way, fair enough. The target is always 1-2s dynamic page loads and 300-500ms ttfb without a full page cache, anything above this means your time in increasing amounts.
