My feeling is that if your account is having performance issues they will gladly prioritize you, as you’re also impacting the shared server as a whole. If that’s the case, send them a message.
I have PS for a while now, and I have see pros and cons in it.
First, it’s on average much faster than DH shared, but I wouldn’t say like the best of th shared servers. For a Joomla site, you still have all your queries going to a shared mysql server. So I would say a “best shared server” with good neighbors would show a much better performance (also taking into account that your files are stored somewhere else too, which has its own pros and cons).
1- Apache is not configured to be very memory efficient (probably it doesn’t have to be in a shared server), and as it’s explained here:
This is not good, when your resources are metered.
2- My sites use very low resources, 250Mb would be fine, but I have spikes in traffic now and then during a day. Which would be fine in shared, but they bring my account down for a few minutes every time it happens. This would not be an issue in shared, but it is in PS (and every other VPS solution for that matter).
This spikes seem to be related to bots, but I really don’t have the time to research it and try to block them.
So in a sense you have to set PS for you highest use (and pay for it) and not average use. The swap memory provided doesn’t seem to work well for me, my sites become unresponsible even before my PS runs out of memory and starts accessing the swap.
The provided graphs are not much help here, as they are slightly delayed, so they don’t tell you what’s really happening right now, you have to have top running (I find that if I don’t, I’m not able to login while my site is low on memory).
Also average memory usage went up without noticeable change in my sites or traffic, and I would guess this has something to do with the PS setup, So now I need to maintain my resources at about 330Mb.
3- People are having difficulties in switching back to shared. So be sure that’s what you really want.
To sum up, I found out that VPSs (not only DH PS) have their cons, and they aren’t always best then shared. Specially if your usage is not very average. So while they seem to be the next step from shared, they are not always the best solution.
As far as comparing DH PS with other VPSs, I guess DH PS is much better value, you get all the managed server (like shared) and also you mail and mysql doesn’t use you memory. So if you need something like 300Mb here, you would probably need much more in a VPS somewhere else.
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