Short Description: configure the maximum size of the the NSF Monitor Pool Size.
The NOTES.INI entry configure the maximum size of the the NSF Monitor Pool Size.
The default value for this parameter is 40 MB. Half of this would be used by events and presumably the remaining half would be used by rules. In at least one case, doubling the value to 80 MB resolved the issue. The optimum value for this parameter is variable and dependent on your particular configuration.
There is no kown UI setting for this notes.ini variable. But you can specify this setting in the notes.ini settings tab of the configuration settings document.