Hello AMDbuilder, thanks for the reply. I'd like to underline I really appreciate all the efforts you all are doing to help me.
Yes I thought it was something about corruption, but being the error random (it seems to depend on the server load as in some hours it works, in some other it won't without considering the first byte sent timing) I suppose it's some misconfiguration server-side, and unfortunately the host support is laconic and evasive. They asked me what are the pre-requisites of the CMS I'm trying to run. I don't think they're asking for
these info, as they're "normal" requirements, more or less. I'll try anyway. What discourages me is that my local server with just an Intel Atom CPU and a little SSD (they claim to work on a SSD cloud) burns 100 times the speeds of their service (not only with IonizeCMS/MODX, but in general). Even with normal MySQL usage.
BTW just to talk a little bit about hosting...
I know OVH, a french hosting company, by a while. They've recently created a new VPS solution for... well, cheaper than cheap hostings. VPS (traditional) and VPS (cloud). The first approach is a VPS on a server in a webfarm and it starts from ~2.5€ a month (yeah, THAT cheap), the cloud one starts from ~11€. Just because I don't drink coffee (and thus I have some more spare euros to throw away), I opted to try for one month of the cheapest solution and, surprise surprise, it's working FASTER than MT, for less than 1/5 of the price! First byte sent is flashing fast even testing connections from the other side of the world.
I don't REALLY know how it will perform at heavy load (it's 1 virtual CPU, 1 GB of RAM and 10 TB/month at 100 Mbit), but hey, it's scalable and you can always go to the next plan whenever you want! OBVIOUSLY MODX runs smoothly. The only downside (not for me) is that you have to configure the web services!