# Agentless RUM data bandwidth usage

**URL:** <https://community.dynatrace.com/t/agentless-rum-data-bandwidth-usage/21067>\
**Category:** Real User Monitoring\
**Tags:** real-user-monitoring-classic, dynatrace-managed, network-monitoring\
**Created:** [December 15, 2020, 6:21pm UTC](https://community.dynatrace.com/t/agentless-rum-data-bandwidth-usage/21067 "2020-12-15T18:21:15Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![fstekelenburg](https://dub1.discourse-cdn.com/dynatrace/user_avatar/community.dynatrace.com/fstekelenburg/32/22029_2.png) [@fstekelenburg](https://community.dynatrace.com/u/fstekelenburg)\
**Post date:** [December 15, 2020, 6:21pm UTC](https://community.dynatrace.com/t/agentless-rum-data-bandwidth-usage/21067/1 "2020-12-15T18:21:15Z")

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I was wondering what the average expected network bandwidth utilization is per user session using Agentless RUM, considering Dynatrace Managed.

For Session Replay a guideline of around 100 KB per minute or 500 KB per session is described in the documentation at [Session Replay | Dynatrace Help](https://www.dynatrace.com/support/help/how-to-use-dynatrace/real-user-monitoring/basic-concepts/session-replay/#expand-2070what-is-the-bandwidth-consumption-like). I imagine sessions without SR result in a fraction of this.

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**Author:** ![sia\_h](https://avatars.discourse-cdn.com/v4/letter/s/f14d63/32.png) [@sia\_h](https://community.dynatrace.com/u/sia_h)\
**Post date:** [December 17, 2020, 12:26am UTC](https://community.dynatrace.com/t/agentless-rum-data-bandwidth-usage/21067/2 "2020-12-17T00:26:00Z")

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Hi Frans,

You could perhaps have a look at the beacons sent by the JavaScript agent. I’ve had a look on a production Application. It generated an average of 3 beacons per User Action. Each beacon had a size of 1.1 kB.

Beacons are the monitoring signal sent back to the Cluster. You could do a calculation based on the number of User Actions and beacons sent.

Sia