A system and method for addressing the impact of tenant/user customizations on various operations in a multi-tenant computing platform. In one embodiment, the system uses an operating system process (e.g., a parent process) to handle incoming operation requests to the platform from one or more tenants. If an incoming request specifies that a user customization should be executed, then the parent process coordinates execution of a separate operating system process (e.g., a child process) to execute the customization operation and return the result of the child process execution. In this manner, a single parent process may create several child processes to execute different customizations that each may be monitored and managed separately for resource use and consumption.