I felt as if it acts faster and better, but had no measurable results (as the broken Cacti system did not work at all). I have decided to propagate the change to a local system I have, which is running Cacti locally. This is a virtual machine, dedicated only to this task.
Almost a day later I can see the results. Not only the measurements are continuous, but the load on the system dropped, and the load on the VM server dropped in accordance. Check the graphs below!
These measures talk for themselves. From now on (unless it’s realy vital), spine is my perfered engine.