I currently use two reseller accounts located at different hosting companies. This was a deliberate choice to ensure that if something went wrong at Hosting Company A then I could switch to Hosting Company B.
As with all major decisions like this I did some extensive testing during the approval window before making the commitment.
Some six months later I can see a significant difference between Hosting A and Hosting B. One is faster than the other. The slower one also seems to be subject to some variance on performance. There are many reasons why this may be the case, some I know about, others may remain a mystery.
As I am working mostly in the new hosting space I tend to notice this before anyone else does. Those that have hosted with me for over a year will know that I pulled all of my sites out of HostPapa for this reason. The UK performance was very poor following some changes made by HostPapa to the MySQL database server. It never got any better after the changes and following some extended dialogue with the hosting company, I decided to move everyone out.
Towards the end of this year I will review things again. I tend to have several support cases going on with my hosting suppliers, there have been several events over the past month which indicate the slower of the two hosting packages I use have been experiencing technical problems.
One issue was caused by the hosting company deliberately disabling the newsletter plugin on a site. I only found this out after 4 hours of trying things. Only when I moved the site in question to another location did I find out it all worked. Following a rather heated technical support exchange and asking them to check for certain things, they found an automated function kicking in and causing the problem. I frequently find that the 1st level support people, and sometimes the 2nd level too, know less about there systems than I can ascertain looking from the outside. I would hope for better, but this seems to be the case in many areas outside of IT too.
It is quite likely I may move around 15 sites to alternative hosting later this year or early next year if things do not improve. As things stand right now, all of the sites are up and running, a small number of them are running slower than the rest.
If you are concerned about the performance of your site, please contact me, I can then check it, and take it up with the hosting company. Do however bear in mind that the SLA (Service Level Agreement) that the hosting vendors offer is something like 99.9% systems availability. That .1% equates to 525.6 minutes of downtime per year or 8.8hrs. As far as I am aware both hosting suppliers are currently operating within those levels.

