Hi Frank,
Just to let you know time to first byte can vary wildly from B to F on webpagetest and perhaps by around 10-20 points on PageSpeed with differing severity of reduce server response time. I am putting this down to having a shared hosting account because late at night, when presumably other clients on the shared server aren't experiencing high volumes of traffic themselves hence permitting more of the server's resources to myself that I seem to achieve the best scores in the benchmarks!
If this is the case do you think it would be better to change hosts to a VPS plan with a company that are very local to me who use standard discs or with a company still in the same country as me but with their servers perhaps 100 miles from me but use faster SSD drives? This of course assumes all else being equal, such as service, uptime, etc. Also worth noting that the business's client catchment area is not inter/national just local/regional.
Thanks