We highly recommend that moderators, participants and observers measure upload and download speeds beforehand.

As a researcher we’d suggest you ask participants to confirm they have done so before they begin a session.

Insufficient bandwidth is likely to cause significant disruptions to your session. 

WiFi Upload and Download Speeds 

We recommend at least 5Mbps available for both upload and download.

This is a conservative estimate and successful sessions happen at lower speeds under ideal conditions. 

In practice, this means all parties must be on a good WiFi connection or use a wired internet connection (ethernet).

🚀 Pro tip! Using a mobile 4G or 5G connection is not recommended.


Unloaded latency measures the round-trip time of a request when there is no other traffic present on a user’s network.

Loaded latency measures the round-trip time when data-heavy applications are being used on the network.

We recommend a loaded latency below 500ms for an optimal session.

Here's an example of good WiFi

Check your Internet Speed

You can test your internet speed at https://fast.com/

A note for moderators and observers

In general it’s more important that the participant (or the device running the SelfTest, Remote LiveShare or In-Person LiveShare) has 5Mbps upload speed available, since the participant is generally sending more data than they are receiving. For the moderator and observers, it’s more important to check download speeds.

However when the moderator shares their screen during a session it's important for the moderator to have 5Mbps upload speed available. And it's important for the participant to also have good download speeds.

If you are still experiencing issues after meeting the suggested requirements please reach out to our support team and we will troubleshoot the issue with you.

Reliability is the highest priority for Lookback and we follow up on every report. 

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