A system and method for monitoring the performance associated with fulfilling resource requests are provided. One or more client computing devices obtain an original resource request and associate a record identifier with the original resource request. The one or more client computing devices also determine performance data associated with processing each embedded resource request included in a response to the original resource request. Each embedded resource request is associated with a component record identifier that is associated with, but different from, the record identifier of the original resource request. The one or more client computing devices can then transmit the determined performance data with the record identifier to another processing device.