I have had these issues with one solution, which have stayed since Servoy 3.5.
I am sure it is my fault, but tracking down the issue is very hard. I don't use .recalculate, but find that the server CPU usage from servoy goes up and up and up until reboot of the server, which we have been doing every night in order to bring it back down.
However restarting Servoy sorts it out, so we now use CURL to do this curl -o result.html
http://xxxxxx:xxxxxxxxxxx@localhost:808 ... dmin/?rf=1rather than restarting the server.
The main culprits maybe undeclared global variables or memory leakage from a plugin, but I find the a daily restart of servoy keeps it under control.
I have no idea how to try and find the exact culprit though!
David