ContributionsMost RecentMost LikesSolutionsRe: Mobile web Performance Testing Hi Richjb, We have had a similar need and have used the REQUEST HEADERS in the 'Playback Settings' section to add a 'user-agent' header with a value of a desired mobile browser. I our case we used an iPhone UA string. As our site responds differently by displaying the page differently based on the device in use we can see instantly whether the page formats correctly or not. This has worked well for us.